You can be assured all of the gears on the can motors are pressed on. Unlike some of the Pullmores with the worm machined into the armature shaft, the gears on the can motors are a much larger diameter than the motor bearing. The motor could not be assembled otherwise.
I use CA glue to hold the gear onto the larger motor. Its difficult to drill for a press fit as the size has to be precise and its only luck that a drill bit will be exactly the same or a half thou. smaller than the motor shaft. Tie some cotton string around the shaft next to the bearing to catch any CA that might try to creep into the bearing.
Pete
