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Balanced?
Backlash compensated? - better still, adjust the meshing
I had an issue with an HEQ5 where the peened on spur gear on the motor slipped - got to the point where it failed (the motor simply rotated with NO movement of the spur gear).
QC on the earlier SW mounts was pretty spotty. 1 failed HEQ5, 2 failed NEQ6's for me. Put me off SW mounts a LOT.
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