The hinge pin on Parker's is actually a replaceable part that also has the extractor arm attached to it. It can be tricky to get out and fitting up a new one is difficult too since the fit is so tight in the frame.
Some wear to the hinge pin which causes some side to side play, can be fixed sometimes by lightly peening the very underside of the barrel lug in the right spot.
A piece of shim stock can also be used on the barrel lug to compensate for wear.
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B. Dudley
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