I had some 2mm ID x 6mm OD x 2.5 mm wide bearings on hand and a 2mm x 8mm shaft that fit.  Designed some 3d printed parts around these to hold the magnets.  Magnets were 6mm x 1.5mm that were on hand as well.  Drilled a 5mm hole in scrap PCB to test, slightly skewed.  Seems to spin okay with just bearing and shaft but it's hard to hold.   Test PCB was 100mm x 60mm vs 90mm x 50mm.  Spun nicely when held in vice.  Clearances were a bit loose on first batch of 3d printed parts.  Magnets slipped out and shaft bore was a bit loose.  Added the jolly wrencher logo for some HAD bling.