Chuck the screw into an electric drill and go to work with 220 grit wet or dry paper. A shot of light oil goes onto the paper, then just turn on the drill and spin the screw head, sort of moving it around the paper so it gets “new” grit all the time. Change to 320, then 400. If you want a matte finish, you might stop at 220 or 320. If you want a higher polish go to 600 and don’t use oil, allowing the screw to run in the same spot for a while. You can get a higher polish using crocus cloth or by polishing with rouge and the Dremel and a felt bob or rouge on a stiff cloth and use the drill. I stopped at 320 as I wanted a softer finish.