I have a circa 1894 38wcf that I recently sent in to Turnbull to have them fix some restoration work that they performed a few years ago. The cylinder on this gun had a slight rattle (rotational, not front to back) and I asked them to take a look at it while it was there. They prescribed a new bolt, which they fitted. When I got the gun back I noticed that the rattle was gone and everything was nice and tight. 4 really nice tight clicks, everything locked up tight. So far so good, until I tried rotating the cylinder on half cock. What I immediately noticed was that there was barely any sound when I turned the cylinder, that is, there weren't the clicks I was expecting just a very light sound...and the rotation was very sloppy and loose. Moreover, I could even turn the cylinder backwards (counter-clockwise) with very little force. So, I took the cylinder out and noticed that on the 2nd click the hand wasn't sticking out into the frame as far as it should (pic below). I cycled the hammer a few times with the cylinder out and I wasn't able to reproduce the problem. I put the cylinder back in and so far it seems to be back to normal. Any idea what happened and how I can fix this if it happens again? Is the sear spring maybe too weak?