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Thread the M3 grub screw into the pinion gear slightly so you don't lose it

Slip the pinion gear onto the motor shaft with the grub screw facing down, towards the motor.

Slide it about 3/4 of the way down the shaft and tighten the screw.

The compact but powerful motor has a fully round shaft. - some of the older kits used the slimline motor which has a flat on the shaft.

As of March 2019 the compact but powerful now has a flat ground on the shaft.