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M3 - friction in the hammer/valve system

@Vetmx thanks for the details. I can never get enough data points.

@bigHUN @Scotaty Thanks for the polishing info. That's exactly what I had in mind, so good to hear it will improve things.

@Stubbers . Dimensional tolerance variation is a good theory. Considering that the design seems borderline with the backing for that PUR 90 oring, maybe some variance in the plenum front end (E101) and/or valve-rod diameter results in some guns being more picky than others. Hopefully the polish and oring replacement works and I don't have to go down the parts swapping route.