Single flange joint mount, use this to directly mount a set of couplings. Good for short length needs. It will accept a 1/4 x 20 or M6 screw through the center. This can be mounted to a dash mount or any flat surface that will accept a screw. Corse threaded screws can be used to mount this to woods/plastics.
You can use a coupling from a previous arm or purchase one here.