i realize this is an old thread...I recently purchased a 4516-1 and I would like to replace the bobbed hammer as well. Which hammer is a direct replacement for the 4516-1?
Thank you for your assistance.

Recently a 5943 came across my path in trade...and after handling it...I became a pseudo collector of S&W 3rd Gens. I now have 4...lol I have decided that I like the SA/DA over DAO and am also curious as to whether I can modify the 5943 to accept the hammer or more accurately convert it to SA/DA?