FTC Tetrix / AndyMark Motor 9:1 Gearbox, Hypocycloidal single stage - V4

Gearbox for FTC Tetrix / AndyMark motors. Slows motor speed down by 9:1.
Requires three 6-32 x 1" screws, a Tetrix motor hub, small screws to mount the part to your motor of choice, three standard Tetrix nuts, and one 6200ZZ bearing ($1.49 at vxb.com).
Thanks to all the great hypocycloid gearbox references out there and to the hypocycloid examples on Thingiverse.
http://youtu.be/xktsFLkfRto