in this case adding a shim won't help. The screw head is tapered, so thicker on one side and I need it farther in to enable the top lever to clear it. If I back it out part of the screw head sits up proud.
Okay, so now you have determined what the issue is, now you need to figure out why. The pin could be damaged, so could the trigger plate it screws into. Has the top lever spring been replaced? Sometimes a replacement top lever spring can interfere with your inletting. You can use inlettting black to see if something is stopping the metal from seating to the correct depth in the wood. If the metal fits as it should to the wood, also see if the pin will fully seat in the metal without the wood installed. You mentioned it might be restocked, check to see the pin is not binding on the stock.
Let us know what you find.
Steve
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