Quote:
Originally Posted by Joey Milia
There shouldn't be any torsional force on that inner shaft. All the force from the motors is transmitted through the balls to the drive shaft, not to the inner shaft.
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The flat of the bulge of the inner shaft is not centered on the holes, meaning that as the gear turns, it exerts force on the balls inwards as the balls ride partially on a 45 degree slope. This effects a linear force on the inner shaft along the axis of said shaft. (Mind you, I've never damaged the coupler myself, so this is all theoretical.