Lionel might already have a slightly longer shaft that was intended for use with a different loco. The gearbox is cast into the chassis with ball bearings to take up the thrust from the worm. The motor mount is rigidly fixed to the chassis. So it's not like you have to worry about the distance between the cups getting larger or smaller, as you would on a Williams loco with sprung drivers and a gearbox separate from the chassis.
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