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before you do anything, answer yourself this...how old is this gun? if its relatively new (like less than a year, and you are the original owner, call PMI and have them send you a new setup, cupseal and valve), if its old and you are not the original owner i would simply go get a new valve and cupseal.
odds are that something is wrong with one or both, and i doubt that filing will really solve the problem, allthough, you may try it if you have the $$ to back up your "mistake", and you might even save a buck or two in the process.
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