In this video I show how you can make very simple screwed ball turning mandrels which can also be used for holding other components. Also shown is an excellent set of drills plus a new thread chamfer tool that allows screw tapping and thread burr removal all in one go. SEE LINKS BELOW:-
Drillpro M35 Cobalt Drill Bit Set -- https://bit.ly/3hCq8gW
Drillpro HSS Deburring Tap Chamfer Tool -- https://bit.ly/2Yddg9F "