By Cults on August 29, 2019 23:02
Very effective, I have adopted it for my personal use (see photo). Original creation: https://www.thingiverse.com/thing:3122067 Uses ABEC 9 ball bearings, available on amazon for about ten euros. If possible, attach one of the two bases to the table with 2 screws, the other one remaining free to adjust to the different coil widths.
3D file format: STL