Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5153121.

This is a custom power wheelchair joystick to provide a different method of manipulating the drive controls. There are parts for two different joystick shaft diameters, for an Invacare and Rovi power chair.

The part uses a 1/4-20 screw as a set screw to fix it to the joystick shaft. The hole can be pre-tapped or self tapped with the screw.