universal flat spool holder

small discrete universal spool holder. works for everysize spool and is strong enough to easily hold 20kg.

The holder consists of two plates (a lower and a top bearing plate) with races to allow for 5mm (diameter) thick steel balls. there is a spacer/cage for these balls included to keep them spaced properly.

additional a fillement guild could be used, but i found it not needed.
I did use some double sided tape on the underside of the holder to keep it in place, with the vibrations of the