I need to change out the rear wheel on my new Radrover 5 - short question:   is it safe to hand-tighten the rear axle nut on the motor cable side  to re-assemble the rear wheel after changing a flat, etc? 

More detailed Q:   How do I torque the rear axle nut to the correct nm? there is a cable coming out of the middle of that nut !!    In the Radbikes official video it  shows the owner hand tightening with an open-ended wrench, no Torque wrench.   And the caption below says to torque to 35 or 40 Nm, implying a Torque wrench  should be used - how to do this on the motor cable side?  This can only be reached with a (fancy IMO) clawfoot attachment to a Torque wrench, but that's a bit involved and those are tools that I don't own.

My guess - most owners just hand tighten and go for the feel of 'tight enuf but not too tight'. Is that safe given all the forces on an e-bike?

Thanks in advance,

Bob