In addition to my regular job, I also make knives. I have plenty of experience in heat-treating them properly. I heat them up in my kiln until they will no longer stick to a magnet, then I plunge them into oil. None of my knives has ever broken (as far as I know). I use high carbon 1040, or 440C stainless steel for the blades. I have an unusual situation. My FiL is my shooting buddy. His Dan Wesson revolver has developed a small crack in the frame, and since he his not an idiot, he no longer shoots it. I found a terrific bargain on a DW revolver and he is going to transfer the "guts" and barrel(s) of his into it, and thus have a safe and functional DW 357 again. I will thus have the leftover "innards" of a DW 357, a 4" barrel, and a frame with a tiny crack developing in it. My question is... If I heat up the frame enough to hammer the crack shut, then do my regular knife blade heat treatment on it, will the frame be okay to use? I am not willing to try this without expert advice, and THR is the best place for that, IMHO.