I have addressed a slow timing on one cyl hole a few times like Jim suggests. Works great. I mark the ratchet tooth needing attention with a magic marker so it is easy to find after you close the cyl to see if you fixed the problem. I envy the heck out of you being able to do this yourself. Jim is handy at customizing S&W's also. I look forward to seeing the progress on your gun, very interesting. Larry