These guys list 3 different brands of brake shoe grinders for sale. Scroll down to the bottom of the page. http://www.allstates.com/BrakeClutch.html They used to be very common and they all kind of work on the same principle. There were several of them in shops in town when I was growing up. I never bought one. I'm sure they sold for a song when the old shops were liquidated. I haven't actually seen one around for quite a while.