Ryan,
I think I understand your reasoning, and based on that, only disagree on one minor point:
Quote:
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Thus, the only forces that could generate L are reaction forces.
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There is also the weight of the module, which is applied at the CoG, presumably a bit below the drive bearing when the module is horizontal, and thus will provide a slight torque about the drive bearing, and produce a bit of L in the upward/right direction. However, I have already argued that this force is negligible compared to the drive forces.