If your clip-on device does not have it's own counter nut, you need to buy counter nut in appropriate thread size.
The following connectors have built-in system for orientation of device, no need for...
Conversion kit for Rusan modular adapter to be without quick-release lever (includes screw and bushing)
Fits Rusan modular adapter clamps MAR-xx
Includes new allen screw M5 and special nut which...