3M makes a 3" round arbor and pad 1/4" arbor I think, it has velcro backing and they also make a 3000 grit round pad to go on it. I got a few from local parts store. I have used it in cordless drill or die grinder either will work. Make sure to keep it wet as it will burn the plastic. I had a set of white plastics that had a bunch of spots of some sort soaked through, followed the mentioned steps with sandpaper, then followed with A LOT of time with the 3000 grit, then polished with plastic resore. They came out pretty good.