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If you have plastic safe Loctite on hand, you may want to completely remove the screws, add plastic
safe Loctite, and then reinstall them.
Slide the motor up until the gears mesh firmly. Tighten the 3 screws finger tight.
Spin the gears at least 2 full rotations by hand and make sure they spin freely with no binding. If there
are tight spots, rotating the gears should allow them to self-adjust.