Parametric Ender 3 Bed Clips

I have the official Creality borosilicate glass bed, but I flipped it over and installed a PEI sheet. I wanted a bed clip that had a good bit of tension to hold the bed down, but none of the clips I found on Thingiverse were tall enough. Trying to scale them up was a bit of trial and error that I wasn't up for.

So this is my first stab at trying to make a parametric object in FreeCAD. It's designed so that it will firmly grip my bed surface. The opening can be adjusted for the thickness of t