I have a very old Smith and Wesson No. 3 Model in 44 calibre that needs repair. I can chock the handgun but the cylinder does not lock into place. In otherwords the cylinder rotates freely. How can I get this fixed ? Who out there is a good gunsmith that can do this for me ? I live in Canada and a little hesitant to ship this gun as it is a very old and expensive engraved antique. Tim