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Just as a theory, I still think that the bevel gear should be shimmed like all other gears, if it were to mesh with the motor because the pinion gear is pushing it up, I think that it would create an uneven distribution of force on the gear axle, and if the bushing or gear quality is poor (there is a gear wobble, even if unnoticeable), it would cause gear tilt, and mess up the teeth meshing with the spur gear as well... And I run 2 bearings with the bevel, which are more susceptible to damage, so just as personal preference I would recommend just regular shimming on the bevel, and then accordingly adjusting the motor height.
You won't really come off any worse?
Then again, I'm just a perfectionist.
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