that helps a ton thanks. I just finished my fluid bed prototype. I stuck 3 pager vibrate motors on the 3" coupler. After busting a few motors and frying a transformer it works. I put springs on the cap so it shakes and has the air. I might do 3 more motors, there less than a dollar so it's not bad. Doesn't work as good as a board with springs and a palm sander bolted on, but it's smaller. No more stiring and powder coat volcanos.