Slight looseness ("off-face") can be remedied for safe-shooting purposes by shimming the hook as a "temporary" fix. Determine how loose the gun is by finding the largest feeler gage you can close the gun on without forcing it (place the gages between the chamber end of the barrel and the breech face of the receiver). When you determine the thickness of that gage, make a shim out of stock of that thickness (or slightly less) or just use the feeler gage itself to cut the shim from. For instance, if the gun will just close on a .002 gage, make a shim out of .0015 stock or gage leaf. Cut the shim to fit the curved surface of the barrel hook that fits around the hinge pin of the receiver. Pre-bend a curve into the shim by wrapping it around a drill bit a little smaller than the hinge pin diameter, until the shim takes on a curvature that matches that of the barrel hook. Apply a dab of grease to the shim to stick it to the hook and carefully re-assemble the gun and check the fit of barrels to receiver. If too tight, go down to the next size stock and make another shim. If too loose, go up a size. I have a couple of Parkers I did this "temporary" fix to years ago, and I'm still shooting them that way because they work perfectly and I hate to send them off for a proper repair, but I'll get around to it.
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