This question couldn't have come at a better time for me. I recently purchased a 50's vintage Colt SAA, and in the course of my first range session, I noticed that the cylinder pin showed a tendency to back its way out during firing. It only takes one or two rounds fired to have this happen to a noticeable degree.
I put a few turns (not many) on the slotted screw portion of the cylinder pin locking bolt, but this didn't seem to have any effect on the problem.
Any suggestions on how to proceed from here?