It vibrates so bad it will make you dizzy if you look at to long. Tried to tightn it up and it is tighter than it was. It appears that the two screws that hold it to the center strip only tighten down so much until they strip the rubber strip. Not a very sturdy way to mount it. Maybe its rigged, as I purchased it this way and am trying to make it right, on my 1952 Chevy 1/2 ton truck. Thanks HUGH
