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Steve, inspect the sides of the hammer, mainspring etc for signs of rubbing. If nobody installed a lighter spring then there must be something slowing the hammer's travel. If you find any marks to indicate this, carefully polish the offending area of the frame to get rid of the burr or rough spot. If there are no signs of any interference I'd look next at the firing pin and firing pin hole. The pin could be bent or there could be a ding or burr at the hole that is slowing the pin down. If everything looks good you could just need a new mainspring. George
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