The most number of repairs I get on these pistols is the bending of the pressure plate because owners over tighten the brass nut before closing the lever. When the pressure plate gets slightly bent it "over cams" and drops the capsule nozzle back a few thou off the seal and the gas leaks. Immediately they think the seal is worn which it isn't. I just re-bend the Zamak casting and try to re-educate the user.

Baz