Attaches a phone or switch to the Pro controller. Requires a rubber band and 1/4-20x1.5 inch screw with nut (or M6 x40 would fit). If you don't have the hardware you can download models from McMaster-Carr.
Extend piece snaps onto main assembly and locks onto the square cutouts. Extend piece not needed if you are only using a phone. I would recommend to use the extend piece for larger devices and add rubber bands to top and bottom brace to prevent slipping.
The author remixed this model.
Made living hinge so that it doesn't need to snap onto controller. Beefed it up to fit the switch.