Feet for my new home-made rack

I built myself a new audio rack as a quarantine project. You can see it in the first photo on my systems page. The shelves are Baltic birch plywood, and the uprights are clear Douglas fir 2x2s. The shelves are dadoed into the uprights and secured with glue and long framing screws hidden by plugs.  It's pretty rigid, and actually sounds better than the steel-tube-and-particle-board unit it replaced.Total cost was well south of $200, and I had fun (and some frustration) building it.

But—the current feet are some cheap screw-in cones that allow me to level it, and they sit on little saucers to protect the wood floor. I can't really find much by looking around at the usual places, so if anybody has any ideas I'd love to hear them.