Tai Chi (ish) Disc

Simple Tai Chi like disc with curved diagonal. I use it anywhere I need something round, like a spool adapter.
**SCAD module dr_build takes 3 parameters, outer diameter, ring width and total thickness.
Now customizable !!!!!!!**
Easiest way I could think of was to create a cylinder with a second cylinder about half the diameter of the original inside it, cut it in half, then copy the first half inverted and rotated, et voila a basic Taichi curve.