From numerous exceptions at trial, defendant brings forward nine assignments of error. We find no prejudicial error and affirm.
I.
[1] Defendant charges error in the refusal of the trial court to grant defendant’s request, made just prior to jury selection in February 1980, that he be granted a continuance. Defendant complained to Judge Bruce that he lacked confidence in his court-appointed attorney, and asked that he be allowed time to discuss with his family the hiring of private counsel. Citing the fact that the defendant had been indicted since October, and thus had had adequate time to secure other counsel, Judge Bruce denied the request.
Before this Court, defendant recognizes that a motion to continue is normally addressed to the sound discretion of the trial *610judge, and hence is customarily reviewable only for abuse of that discretion. 4 Strong’s N.C. Index 3d, Criminal Law § 91.1; State v. Rigsbee, 285 N.C. 708, 208 S.E.2d 656 (1974).
Where a constitutional right is involved though, as defendant claims here by virtue of the sixth amendment’s guarantee of effective assistance of counsel, a motion to continue is deemed on appeal to present a question of law, and is therefore reviewable. State v. Brower, 289 N.C. 644, 224 S.E.2d 551 (1976). If a constitutional violation is shown, the burden shifts to the State to prove that such error was harmless beyond a reasonable doubt. G.S. § 15A-1443 (b) (1978). If the State does not do so, the court cannot find it to be harmless error, and the conviction must be reversed. Chapman v. California, 386 U.S. 18, 87 S. Ct. 824, 17 L. Ed. 2d 705 (1967). Here however, we do not reach the question of harmless error because defendant has not presented a cogent argument that he was denied his constitutional right to counsel when the trial court denied his motion for a continuance. Our own examination of the record leads us to conclude that the defendant was adequately represented. This assignment is overruled.
II.
Defendant next assigns as error the failure of the trial court to sustain three objections made by defendant during the testimony of Mrs. Lowe. In the challenged testimony, Mrs. Lowe stated that she was not sure how good her husband’s hearing was on the side where he had been shot; that she can still see the defendant’s face when she closes her eyes; and that she let the defendant take the money because he had a gun. While defendant may be correct in his assertion that these answers were in places speculative or unresponsive, neither the defendant nor the record shows that the errors were material or prejudicial. Absent such a showing defendant is not entitled to a new trial. State v. Jones, 278 N.C. 259, 179 S.E.2d 433 (1971).
III.
[2] By his next two assignments of error, defendant contends that the court erred in ordering that the defendant be restrained in the courtroom by the use of shackles, and that the curative instruction given the jury by the court was insufficient. On its own motion the trial court made the following findings of fact before ordering that the defendant be so restrained: (1) that the defendant was charged *611with armed robbery and assault with intent to kill inflicting serious injury; (2) that defendant had other serious charges pending against him and had the previous week received a sentence of not less than forty nor more than fifty years on a different charge; (3) that there was an outstanding warrant for escape against the defendant issued by the State of Maryland; and (4) that because many of the sheriffs employees were involved in a special venire which had been summoned from Perquimans County to Dare County there was only one deputy sheriff to serve as bailiff and security officer for the court. Based on those findings the defendant was ordered shackled until such time as more deputies might become available.
Defendant’s primary contention before this Court was that Judge Bruce’s decision was based only on circumstances within the courtroom. The defendant argues that absent a showing that he had previously tried to escape or evidence of a planned escape, Judge Bruce abused his discretion in ordering that defendant be shackled. We disagree.
The seminal decision on this question, recognized as controlling by both sides, is State v. Tolley, 290 N.C. 349, 226 S.E.2d 353 (1976). Justice Huskins, writing for the Court, presented an exhaustive analysis of the issue here considered. As stated there, the general rule is that a defendant in a criminal case is entitled to appear at trial free from all bonds or shackles except in extraordinary instances. However, as stated in Tolley, the general rule does not lead to the conclusion that every trial in shackles is fundamentally unfair. Id. at 367, 226 S.E.2d at 367. Rather, “the rule against shackling is subject to the exception that the trial judge, in the exercise of his sound discretion, may require the accused to be shackled when such action is necessary to prevent escape, to protect others in the courtroom or to maintain order during trial.” Id. at 367, 226 S.E.2d at 367. The trial judge “is best equipped to decide the extent to which security measures should be adopted to prevent disruption of the trial, harm to those in the courtroom, escape of the accused, and the prevention of other crimes.” United States v. Samuel, 431 F.2d 610, 615 (4th Cir. 1970), cert. denied, 401 U.S. 946, 91 S. Ct. 964, 28 L. Ed.2d 229 (1971).
In reaching a decision as to whether a defendant should be shackled, Tolley lists a broad range of factors including “the seriousness of the present charge against the defendant; ... his age and physical attributes;... past escapes or attempted escapes;... the *612nature and physical security of the courtroom; and the adequacy and availability of alternative remedies.” 290 N.C. at 368, 226 S.E.2d at 368. Furthermore, “[t]he information upon which the judge acts need not come from evidence formally offered and admitted at the trial.” Id.
Applying those criteria to the case sub judice, it is clear that Judge Bruce properly framed his order as required by Tolley. The record shows that the defendant was charged with crimes of violence; that he was 29 years old and apparently in good health; that other serious charges were pending against him including an appeal from a conviction the previous week for which he received a forty to fifty year prison sentence; that only one deputy was available to serve as bailiff and provide security in. the courtroom; and that there was a warrant outstanding charging him with escape from another jurisdiction.
Defendant argues that because a warrant is not a conviction, the existence of an outstanding warrant was irrelevant and should not have been considered by the trial court. While evidence of a warrant prior to conviction is improper for certain purposes in a criminal proceeding, that rule clearly does not control this situation. The existence of such a warrant for escape from another jurisdiction is probable cause to believe the defendant had escaped from custody on a previous occasion. Defendant’s propensity to escape must be one of the overriding considerations in determining whether a defendant should be shackled. Any reasonable evidence of such propensity may properly be considered by the trial court on this question. Thus, Judge Bruce properly considered the existence of the warrant for escape in reaching his decision.1
Defendant’s further argument that restraint is proper only if there is evidence of a past or planned escape attempt is also not persuasive. “[A] trial court need not wait until an escape or other violence has occurred in its presence before exercising its discretion.” State v. Johnson, 594 P.2d 514, 526-27 (Ariz. 1979). Where there appears some reasonable basis upon which the judge concluded, in the exercise of his sound discretion, that it was necessary *613for the defendant to be shackled during trial, we cannot say, as a matter of law, that the trial judge abused his discretion. State v. Tolley, 290 N.C. at 371, 266 S.E.2d at 369.
Even if we were to find that shackling of the defendant was improper, that alone would not mandate reversal. The United States Supreme Court has recognized that “the sight of shackles and gags might have a significant effect on the jury’s feelings about the defendant_” Illinois v. Allen, 397 U.S. 337, 344, 90 S. Ct. 1057, 1061, 25 L. Ed. 2d 353,359 (1970). But, in considering the analogous issue of jail clothing, that Court has also indicated the fact that a defendant appears at trial in prison clothing may not always be prejudicial. Estelle v. Williams, 425 U.S. 501, 96 S. Ct. 1691, 48 L. Ed. 2d 126 (1976). For that reason the harmless error rule has often been applied to cases where a defendant has appeared for trial so garbed. Thomas v. Beto, 474 F.2d 981 (5th Cir.), cert. denied, 414 U.S. 871, 94 S. Ct. 95, 38 L. Ed. 2d 89 (1973); Watt v. Page, 452 F.2d 1174 (10th Cir. 1971), cert. denied, 405 U.S. 1070, 92 S. Ct. 1520, 31 L. Ed. 2d 803 (1972). Apparently “it is not an uncommon defense tactic to produce the defendant in jail clothes in the hope of eliciting sympathy from the jury.” Estelle v. Williams, 425 U.S at 508, 96 S. Ct. at 1695, 48 L. Ed. 2d at 133. It is, of course, impossible for us to know whether the shackling of the defendant in this case had the adverse effect complained of by defense counsel, or whether perhaps it evoked sympathy for the defendant from the jury. See State v. Reid, 559 P. 2d 136 (Ariz. 1976), cert. denied, 431 U.S. 921, 97 S. Ct. 2191, 53 L. Ed. 2d 234 (1977). Suffice it to say that no showing of prejudice has been presented to us, nor do we perceive any.
Nor does the fact that the trial court did not employ less restrictive security measures afford defendant a sufficient basis for relief.2 There is nothing in the record to indicate that other means were available, and no such other means were proposed by the defendant. Defendant’s failure to suggest althernatives to the shackling precludes his arguing on appeal that less restrictive but equally effective means were available. See State v. Tolley, 290 N.C. at 370, 226 S.E.2d at 369. Moreover, the trial court limited its order to such time as other deputies might be available, an indication of *614the court’s recognition of the gravity of its decision to shackle the defendant. We hold that under the authority of State v. Tolley, supra, the trial court did not abuse its discretion by ordering, after making sufficient findings of fact as also required by Tolley,3 that the defendant be restrained.
[3] Defendant’s argument that the curative instruction given by the court was insufficient is equally without merit for two reasons. First, an examination of Judge Bruce’s instruction to the jury,4 given just prior to the beginning of trial, shows that he told the jury that the defendant was being restrained only because the sheriff’s department was shorthanded.5 No mention was made of the nature of the charges nor was any reference made to defendant’s record or character. The judge asked all who would be unable to overlook the shackling of the defendant to raise their hand. None did. The trial judge also specifically instructed the jury to put the fact of defendant’s shackles out of their minds in determining his guilt. This instruction fully complied with the applicable tenets of State v. Tolley, 290 N.C. at 369, 226 S.E.2d at 368-69. Second, we note that although defendant complains that the instruction was not repeated to the jury at the time other jury instructions were given, defendant did not request an additional instruction. The burden was on him to do so. State v. Tolley, 290 N.C. at 371, 226 S.E.2d at 370; accord, State v. Stewart, 276 N.W.2d 51 (Minn. 1979); State v. Cassel, 180 N.W.2d 607 (Wise. 1970). In the absence of such a request, the trial court did not err in not repeating the instruction. Cf. Patterson v. Estelle, 494 F.2d 37 (5th Cir.), cert. denied, 419 U.S. 871, 95 S. Ct. 130, 42 L. Ed. 2d 110 (1974) (where no request for instruction concerning shackling requested, state court did not err in failing to give one). The trial in this case lasted less than two days. Defend*615ant’s mere speculation that the curative instruction was not sufficiently fresh in the jury’s mind is without merit. These assignments of error are overruled.
IV.
[4] By his next assignment of error, defendant complains of the trial court’s allowing an in-court identification of the defendant by the prosecuting witnesses. Just prior to in-court identification by both witnesses of defendant as the perpetrator of the crimes, a voir dire hearing of each witness was held. In light of their testimony on voir dire, defendant claims that the subsequent in-court identifications were inherently unreliable.
The voir dire testimony of the witnesses reveals that they first identified the defendant by choosing his picture from among six photographs shown them by police on 21 March 1979. Defendant challenges this procedure as constitutionally remiss. We do not agree. The use of a photographic line-up has been approved by this Court on several occasions. State v. Davis, 290 N.C 511, 227 S.E.2d 97 (1976). State v. Waddell, 289 N.C. 19, 220 S.E.2d293 (1975), death sentence vacated, 428 U.S. 904, 96 S. Ct. 3211, 49 L. Ed. 2d 1210 (1976); State v. McPherson, 276 N.C. 482, 172 S.E.2d 50 (1970). Defendant’s assignment of error as to the manner in which the photographic identification was conducted is without merit. State v. Davis, 294 N.C. 397, 241 S.E.2d 656 (1978).
Conviction based on eyewitness identification at trial following a pre-trial photographic identification will be set aside only if the photographic identification procedure was so impermissibly suggestive as to give rise to a very substantial likelihood of irreparable misidentification. Simmons v. United States, 390 U.S. 377, 19 L. Ed. 2d 1247, 88 S. Ct. 967 (1968). Applying that standard to the case before us, we find that the in-court identification of the defendant was clearly proper.
A close examination of the voir dire testimony reveals that Mrs. Lowe had the opportunity to see the defendant when she admitted him to the house; and that she and Mr. Lowe were with him for at least five minutes in a well-lighted room and for approximately 20 minutes elsewhere in the house. Mrs. Lowe stated clearly that her in-court identification of the defendant was of independent origin and based entirely on her observations that night. Thus its admission was proper. State v. Bass, 280 N.C. 435, *616186 S.E.2d 384 (1972). Mr. Lowe’s statement that the intruder “looked like” the defendant was properly allowed as identification testimony. State v. Brown, 280 N.C. 588, 187 S.E.2d 85 (1972). Any lack of certainty in his identification goes to the weight and not the admissibility of the testimony. State v. Bridges, 266 N.C. 354, 146 S.E.2d 107 (1966). We find the trial court acted properly in allowing the identification testimony.
V.
[5] By his next assignment of error, defendant contends the court erred in failing to allow defendant’s motion to strike Isaac Lowe’s statement, “That’s when he robbed me....” Such shorthand statements of fact have been upheld by this Court before. See, e.g., State v. Goss, 293 N.C. 147, 235 S.E.2d 844 (1977); State v. Sneeden, 274 N.C. 498, 164 S.E.2d 190 (1968). Defendant’s argument is without merit.
VI.
The defendant next alleges that the trial court committed error by allowing the State to introduce a purse and its contents found in the upstairs of the Lowe’s home. While we agree with defendant that the items apparently had no relevance to the case, that alone does not warrant reversal. Rather, “the appellant must show error positive and tangible, that has affected his rights substantially and not merely theoretically, and that a different result would have likely ensued.” State v. Cross, 284 N.C. 174, 200 S.E.2d 27 (1973), quoting State v. Cogdale, 227 N.C. 59, 40 S.E.2d 467 (1946). Defendant has made no such showing.
VII.
[6] Defendant next urges that the denial of his motion for a mistrial by the trial court was improper. The record shows that Mrs. Lowe, one of the prosecuting witnesses, entered the jury room during a recess at the conclusion of trial but prior to the charge of the court. Apparently she did so in order to use the bathroom. Defendant promptly moved for a mistrial. Judge Bruce examined first Mrs. Lowe and then one of the jurors, chosen at random from the jury room. Their testimony established that Mrs. Lowe kocked at the door, came through the room, and used the restroom. She did not communicate with any of the jurors. On these facts the trial court, exercising its sound discretion, properly denied the motion *617for a mistrial. See State v. Gaines, 283 N.C. 33, 194 S.E.2d 839 (1973); State v. Shedd, 274 N.C. 95, 161 S.E.2d 477 (1968).
We have carefully considered all other errors brought forward by the defendant and find no reason to disturb the result achieved in the trial division. A close examination of the record shows that defendant had a fair trial, free from prejudicial error.
No error.
Justice BROCK took no part in the consideration or decision of this case.