README.md 626 Bytes BlameHistoryPermalink Edit freewheelshim.FCStd contains a printable adapter to unscrew Sram 406 Freewheels. The Adapter fits on a 8 mm Inbus 0.1mm oversized. If you have trouble fitting the parts, submerging the print in boiling water for a second helps. YMMV. Worked for me.