Rocketman is correct 99.9%. He isn't exactly correct when it comes to engraving a cased frame. I don't know of an engraver that would even consider cuting a cased frame without annealing it first.
Re-cased frames aren't prone to cracking or breaking apart. The frame must be well annealed prior to re-casing to remove carbon as more carbon is to be addded during the re-casing. I have been engraving and re-casing Colt SAA, Win. lever guns and old doubles for 48 years. By following the mentioned steps, I have never had one come apart. FWIW
