Wormscrew gearbox

####A gearbox designed around a large servo motor, a wormscrew gearbox with 13:1 gear ratio.
The drive horns go through both sides of the gearbox.
The potentiometer is mounted to the gearbox indirectly using an involute gear.

>UPDATE: Use the -1 files. They are newer and make screwing the gearbox together easier.