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As RG sort of mentioned ,the LH arm sees both directions of torque. The drive forwards is transferred through the axle to the RH side as the RH side's forward movement is placed back to the LH side through the axle. The RH side arm/axle fit really only sees the transfer to the LH side and some localization effort to keep the arm in place.
This topic is but one of the many that shop wrenches (with inquiring minds) talk about when it's slow. Andy
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AndrewRStewart