This is my Handel design for Countersinks it is easy to use and has a good strength holding everything with a 10mm shaft. I printed the Mainbody and Tightener-screw with 90% and the shell with 100% infill. All parts are printed with a layerhight of 0,15. Maybe you will need a brim for the Mainbody. I chose PET-G Filament becouse of the good layer adhesion.