12mm button mount for 1/2 inch PVC

I'm building a somewhat elaborate costume, and needed some mechanical buttons to mount on 1/2 inch PVC pipe.

IMPORTANT NOTE: Fusion 360 imports STL files as cm, not mm scale. So, these need to be scaled to 0.1 (10%) to fit standard 1/2 inch PVC. (I've also included an export of the STEP files for CAD software. The free Fusion 360--for hobbyist use--can import these if you don't have anything else.)

This is a _clip_, so it snaps over top of PVC, and can move up and down, and rotationally--i