Reply to "Replacing Hogwart's Locomotive motor with large motor"

@gunrunnerjohn posted:

The motor and worm gear are both purchased separately, you don't use anything from the original motor.  The worm is just pressed on, that could be a challenge if you don't have the proper tools.  The shim is the sticking point I suspect.

Thank you John for your reply as it clears the matter up considerably.