I normally shim the bevel gear so there's no play. But time and time again with this mechbox, I tried and it was always noisy. I thought about it a bit, and figured a BIT of play would allow the gears to mesh better. And it seems to have worked. And technically, once the pinion and bevel gear connect, there will be no lateral play.
And as I said, if it causes premature wear and gear issues, I have spare gears and a spare motor lying around that I can replace them with... But so far after about 2500 rounds (2000 in-game, 500 test-firing), it's all good and running smoothly.
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