I got mine from a vendor and had a b1tch of a time installing it. No I am not talking about the nut. I had to grind like a 1/4" off the bottom of the radius area to clear my tail light guards first off and the inside part that is bent 90 degrees, I guess is for suport, had to have like 1/8 of an inch ground off the bottom because it was bent over too low. After doing all this it went right in the hole and does not rub on my guards. Anybody else have any problems like that? Now I have like a 1/4" gap at the top and if I pull down on the mount I can get it to move up and down. And I have the nut as tight as tight can get. I guess I will be fixin' this with some JB Weld. Anybody have this issue also? I have not mounted the antenna yet. I can only wait for what that brings. I am not the least bit excited about the QC of this product. So much for that warranty I guess!!!