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I agree with mrappe. the peening of the cylinder stop slot and the failure to lock may be caused be a bolt dropping late. You can slightly bend the leg of the bolt stop that rides on the hammer cam away from the cam. That well cause the bolt to drop sooner. It does not take much, just a few thousandths.
Check for any burrs in the ratchet area on the back of the cylinder. Check the channel in the frame that the hand moves in for burrs.
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