The file 'Cassette Winder Bit 4mm 3D Printer Model' is (stl) file type, size is 53.2KB.
Saw the original by @DrMonkeyCPR and thought it was cracking. Remixed it to fit my 4mm battery screwdriver, with a 2mm deep, 3mm recess in the end of it to take a 3mmx2mm magnet for wargaming miniatures, should be available on eBay or Amazon
cassette_bit.stl | 173.6KB |