Look at MMD 2000.07.15.09.  You should still be able to get the gear
replaced for the Kimball player by calling Paul Keglor.  He runs
Dancing Ivories, Inc. in Bay Shore, NY.  I don't know if he has an
E-mail address but he can be located by phone at 1-631-242-0963 USA.

The usual problem is that the small gear next to the motor is stripped.
The gear will cost you about $125.  He is the only source that I know
about.

You will have to know the model number of the player.  This will help
identify the right gear.

Pete Knobloch