Hey Shane,
I use a bunch of those type of grinder bases with my own motors. They work well for the polishing and sanding. I purchased mine fron Brownell's gun supply catalog which is available on-line. I will caution that you can buy a Harbor Freight 6" or 8" grinder for a lot less money. I hate to buy foreign junk, but there are no american made grinders in my price range so I just look at them as disposable. I use Baldor 1 hp minimum motors on mine.
Ralph
