I saw it at a show. I agree with Splint on how to use it. I have a 19 - 38 with 80 grit .  I can always squeeze in a new gadget..

No way I'd try to build this or a cnc or something, since I gotta choose my battles these days I want to win. 

I'm probly going to let you down but, I swear I won't keep you down. John Hiatt