According to friends' feedback, we update the screw knob, now the screw knob is well made.
For rod support / rail system, It used to mount shoulder pad / battery pack block to back of rail system in general. It works if you use it to mount controllers or other accessaries on to your setup.
It can extend application of rod support rail system. Attach shoulder pad, shoulder balance, USB follow focus,magic arm, LCD monitor...If you have more gears, the 4 rods clamp is helpful.
