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Great idea, I love seeing the various devices that people are developing for pnuematic-gun loading. There's obviously a small market for some universal pneumo-loading device judging by the number of efforts to develop something. Good luck with this one
....I do think that your idea is good and probabily with small modifications it will work very well with 8mm shaft.....but I like to use 6.5/7mm shafts and I think this device will not prevent shafts from bending...