Transform obstructions into shelf space

Compounding the problem of my basement shop being too small, its floor is dotted with jack posts supporting the floor joists above. But I turned the problem into a solution with this post-mounted tool platform.

The collar (A) holds the platform at the preferred height. Once secured, I rarely, if ever, move it. Clamps (B) and (C) allow the platform to swivel around the post. Tightening the knob on (C) locks it into position on the post. The tool platform itself can swivel once you loosen the center hold-down screw.
—Jim Murphy, Perth, Ont.