Is it possible (a thought anyhow) to use rare earth magnets on either side of a hole similar to the disc above? I mean if a magnet can be found that is the correct OD to the hole in the disc and then used another 2, one on either side of the disc to hold it in place, wouldnīt that do it? I have a few of these and they have a lot of strength to hold themselves together. I would figure it would be enough for this use anyhow.
there are lots of options with sizing;