Got the magnetic holder shaft connecters done.

Now here's the thing. I made these so the cupped magnets would simply clip into the holder. I'm reproducing my plastic connectors to a really precise set of measurements, but the chinese magnet makers - not so much, lol
First one - the one I measured - clips really clean and tight, it's not coming out short of breaking the holder. I know this as I had to break the test print to get the magnet out.
Second magnet, is slightly smaller and tilts ever so slightly and will need a dab of glue as it has the potential to come out over time. The ledge holding the magnets in is only 0.25 mm wide, which with the correct sized magnet - is all it needs to be :-)

Camera appears to be elsewhere, I'll take some pics when I find it. But the balls go in and can hang at 180 degrees, which is probably 10 degrees more than they'll ever need to :-)
Currently printing some black shaft ends to match the shafts.