Trial and error is the only way to get it right, but if the nut, with set screw turned in and everything seated properly, can't quite snug up the handwheel (in other words it bumps into its limiter boss before everything is locked together), simply take the nut off, turn the washer 90° either way and thread the nut back on. So the set screw is constrained within 1/3 turn but the washer has two positions (because 2 bosses go in 4 grooves) so there are actually 6 ranges available. The washer is simple, but ingenious, because there's no way to predict exactly which 1/8 turn is going to be the sweet spot between just tight enough and too loose. Unlocking is accomplished by backing off the nut ~ 1/8 turn to let the washer slip against the handwheel, thus uncoupling the gears from the motor. The in-facing ones engage 2 of 4 grooves cut in the shaft to lock the whole assembly to the gears. The out-facing ones constrain the nut's set screw, which is turned in last, after the nut is seated. I thank Karl Riemer for the following words regarding adjusting the Supermatic handwheel: A Supermatic handwheel slides onto its shaft and turns freely until fixed there by a knurled nut screwed over a washer that has 2 bosses on the inside and 3 on the outside.
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