I have been using the UDM I just got over the last two weeks and it will vibrate up a storm on setting 6. I was just looking at the pad spin and I noticed that the axis of the spindle is not exactly perpendicular to the horizontal. It is at least 10 degrees off. So that when I put an edge pad on the adapter it will have a high and a low spot if i placed the UDM exactly perpendicular to the car. Is this supposed to be that way or did I get a defective machine? Is there somewhere on this site that I can observe an UDM in action. I've seen the PC being used one handed while polishing and If I tried that with my UDM, it would fly away out of my hand from the the vibrations.