Yup I have used one, it was fun tooThose finishing machines are amazing, ever watch them work?
not as big as this one, the one I used was walk behind. more like the pic in my other post.
I cant seem to get the youtube clip to work so here is the link http://www.youtube.com/watch?v=kq8vqSki2hg (darn thing )
I made another vibrator today,
This one has a 3" dia. ball race with a 1/2" ball. It will start with 10 PSI with a good shake, if it is turned up to 90 PSI it is more like a buzz.