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Shimming helicals is the same as shimming standard gears.
Make sure your bevel gear clears your pinion gear on your motor though. If you adjust your motor height all the way down and it still sounds screamish, you need to reshim your bevel gear.
And be sure to properly adjust motor height after shimming your gears.
Raise it up until it stops whining, but not so much that it screams.
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