The TL;DR of it is I have a reasonably nice Thermaltake computer tower that has some really crappy plastic feet that clip into some plain-ish 10mm holes through the bottom of the case, and the clips on them are breaking off, probably because it's really crappy plastic that are only clip-fit into a sheet metal case, which can spin, and the metal starts to score the plastic, breaking off the clips.

This version is essentially a 1:1 design of the injection-molded feet that come with it. I might attempt another version that screws or get screwed or bolted into the case somehow, depending on how well these hold up.