Cam Lever for Small Arm version of the Multifunction Arm mounting system

I used the step files included with the original models to create a threadless core and nut for the pivots and a cam-lever that uses an M5x45mm bolt and corresponding nut to create the mechanism. 

I created the cam-lever from scratch.  It's recommended that you use the same print settings from the original designer and probably use something like PETG.  Brittle filaments will likely break over time especially if you over-tighten the joint.  The lever part will need supports.

I used the step files included with the original models to create a threadless core and nut for the pivots and a cam-lever that uses an M5x45mm bolt and corresponding nut to create the mechanism.