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you dont lol
even if you had backlash, theres honestly nothing you can do short of machining yourself a new gearbox with new bushing positions.
Helical gears are shimming sensitive to remove backlash, I installed them in my G&P 249 and the bearings are close enough for the gears to mesh, but too far apart for them to be sensitive to shimming, can't remove the backlash.
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