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I worked on 2000 Samick SIG-50 that had probably the worst case of tight center pins I've ever seen -- half the keys didn't play at all, some of the hammers flange centers were so tight that hammers wouldn't ...

Examine the cut ends of the pins. If they are yellow you may also have a plating issue. Poor quality or contaminated felt could also be a factor. ------------------------------ Parker Leigh RPT Winchester ...

It's not plating but rather improper installation of the cloth bushings. Repinning with careful reaming and most importantly vigorous burnishing will stabilize the bushing and permenantly cure the problem. ...