A cheap and effective Holder for 5x10mm round neodymium magnets.

I glued the holder inside of the Bottlecap with silicone first, waited a few hours then added the Magnet which is also glued with a dab of silicone.

If Bottlecaps are internationally different or youre using different magnets, you may have to edit the file or create your own. I left 1mm space in each direction (hole is 11mm x 6mm) for the magnet which is needed if youre using silicone.