When I installed my power antenna in my car I used a dremel tool to shave the fins of the "Induction Grill" (P/N 105515) so the mast would clear the vent fins on it's way up and down. I got a little carried away with the dremel and cracked one of the fins on the vent. Looks like a replacement "induction grill" is available from DMC, but I don't see how to change it? Is it bolted/screwed in? Glued in? Does the quarter panel have to be removed from the car to do it?