Could also be a problem with the hand's proper intrusion into the hand window. If it's not correctly fitted, the hand will not reach and interface with the ratchets properly.
Another thing to check would be the rear gauge, or headspace. If this is out of spec, (end shake) the cylinder can actually be forward enough that the hand cannot pick up the next ratchet properly.
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Ret. LE, FA Instr, S&W Armorer
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