From my experience the square hammer shaft is not tapered and that it can take some time and patience to get a hammer off that is corroded on. Assuming you get the screw out, it works well to just lay the lock/gun on it's side and drip liquid wrench, aerokroil, or some similar compound in there to loosed up corrosion or gunk and just LET IT SIT for at least a day. Be patient. You want the hammer to come straight off and not at an angle, which can round off the end of the shaft which can lead to an eternally loose hammer.
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Threaded Mode