I took the 60 year old Uberti apart the other night to check out the bolt and spring to see if I could help it with the skipping past issue. It looked like it was gummed up some from sitting around and never being shot or cleaned for six decades. The bolt was very tight in the cylinder notches so I cleaned it up and stoned down a small amount of material. I also did a very minor amount of polishing up inside. Put it back together, minus grip and back strap and the problem was even worse! I did notice that the mainspring was too long and the tip was binding on the hammer below and in front of the roller. A couple trips to the garage to visit the 4” angle grinder and it is working wonderfully now! Cocking still takes some force and the trigger is heavy but it locks up just like it should now. I have some Hornady round balls on the way from Natchez and may get to test it out this weekend, if I’m lucky!

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I know the Ruger Old Army hammer springs are stronger (force wise) than any of the Blackhawk springs.

And when I glommed a Great Western in The Cartridge Of Tomorrow! .357 Atomic, I had light strikes, and s disconcerting failure to fire rate. I replaced the hammer spring with one from an 1851 Uberti, and the issue went away.

So apparently percussion revolvers require stout hammer springs, and in your case, they made it too stout. Excellent job of revolver sleuthing, Doug!

This spring is still very strong but it was also too long on the upper end. I my would bind up and actually stop the hammer about halfway down when you lowered it under thumb pressure.

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