In another fourm someone stated about burned out bearings. He says about dust ports should be mount on top, not under. As it is built to take in fresh air from the top and blow it downwards to the motor for cooling. But when it is mounted upside down, the dust should be mount on top to carry away the chips and dust. I made both of the ports top and at the very bottom of the bucket that I built under the table next to my table saw. Whenever I can't use the top ports, the bottom comes in handy. I'm worried by his stating that the bearings would burn out by this. I haven't seen any manual that says no-no to what I just built.... HELP before I'm sorry!