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Eugh, I just realized that I haven't even mentioned the fact that it hasn't been firing. It's not just a sound problem. I also took a gander in the feeder and saw a shot on semi-automatic, and the piston only moved very, very slightly. The sound gets very high pitched as I tighten the motor, and more grindy as I loosen it, yet nothing so far seems to "catch" and I certainly don't get the same sound I was getting before. But right now even with the adjustment screw far looser than it began, there's been no indication of improvement.
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