I have a Smith and Wesson model 29-3 with a 8 3/8 inch barrel. I will be having it shortened to 6". The gunsmith is very well known for his awesome work. He will be cutting it down, crowning it, machining off the original sight, and silver soldering onto the newly cut barrel, then re-bluing the entire barrel. The only part I have to do is replace the red plastic insert on the front sight, that will get damaged in the soldering process. I looked at youtube videos, and found front sight insert kits at Brownell's. I have also received advise from other gunsmiths that have used red knitting needles to tooth brushes, by heating them, inserting them in the opening, then trimming off excess. Looking to hear for ideas, opinions, advice, from anyone having to have replaced the front sight insert on their pistol. Thanks