I have to admit, I'm not sure that I knew these things were called "slip rings"[1]. I've never actually needed one for anything I've built, but I can recall won

I have to admit, I'm not sure that I knew these things were called "slip rings"[1]. I've never actually needed one for anything I've built, but I can recall wondering at least a few times in my life, how you would deliver electrical signals across something that needed to rotate. Now I know. [1]: https://en.wikipedia.org/wiki/Slip_ring https://en.wikipedia.org/wiki/Slip_ring