The ASL 603OM Adjustable Height Driving Platform Mount for the ASL 125 Orbit Joystick or the ASL 128 Molecule Joystick is an angle adjustable platform which allows the joystick to come through the tray so that the client has a platform to rest their hand while driving the chair. Requires ASL 660 Nucleus Mount. Joystick Not Included. Must specify left side or right side mount.