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Out of the box the gears are shimmed to an extent how ever each gear has about .15mm of play. The bearings are not set with adhesive well enough therefore there is wiggle room. Another issue is that the shafts on the gears themselves were cut too short there fore if shimming is required to be heavy on one side you potentially could run the risk of the shaft not even being able to securely seat itself on the bearing. But out of the box they do need a little tightening or loosening on the pinion adjustment screw located behind the mosfet 3 pin connector housing. Cheers
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