actually, no im pretty sure the matchstick thing has to do with the bolt itself, the matchstick would shatter if used as a detent.
Take out yer bolt, there's a vertical pin for yer ram, and a little black pin holding that in. If that's loose, that's where u replace it with a matchstick.
Not sure if this will fix all chopping tho.
Another thing u may wanna do, is to remove the inner part of the bolt from the tip, wrap some teflon tape on the end n screw it back in, not far tho.
As the ball may be rolling back into the bolt, allowing the other ball to come down a bit n thus get chopped.
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