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Well I am new to the world of airsofting, it was something that crossed my mind, I check backlash all the time, (rebuilding diffs and trannys), and there are helical gears in those. Buy shimming one side of the gear more, moves the gear closer or farther apart from the other, thus changing backlash. Of course we all know too much backlash = premature wear and stripping, too little = premature wear, stiffness/binding, and a inefficient gear train.
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