Elmer Keith's book has a diagram on the profile of a slip gun's hammer, and basic instructions on how to make the necessary modifications. The sear leg of the sear-and-bolt spring can be removed, for example. A slip gun, once modified, has little that can go wrong, mechanically. I found it to be of academic interest, because of how a broken SAA can likely be made shootable if made into a temporary slip gun. For example, a slip gun needs no sear notch on the hammer, no trigger, and, as already mentioned, only one leg of the sear/bolt spring. It may well be that a slip gun needs no notches on the hammer at all, IIRC, if the sixgunner is experienced enough to free the cylinder for loading without needing the half-cock notch.
A slip gun, can, of course, be fanned, too, if that tickles one's fancy. Not my cup of tea.
It is not, by the way, that Elmer Keith recommended or advocated slip shooting. He made it a point to learn slip shooting, and wrote about it in detail, but did not adopt it himself.
