Those do look handy as hell! I just made one out of a small screw, washer, coupling nut and a piece of 80 grit sandpaper. I had no idea they made such a thing!
Me either thats smart how you made yours i wish I would have thought of that I used one of those mini flap discs on a air grinder. It messed my paint up im gonna have to go back and touch it up
