This backplate is mounted on the camera base and provides a 15mm pole. so you can install the Focus1 motor to your device with a 15mm small rod. The pitch design of the rod connector allows you to comfortably place the motor on the focus gear of a lens with a front end diameter of 105 mm. And it's easier and faster to balance on a single handheld stabilizer.
1. Backplate with 15mm rod
2. 1/4" screw