I want to re-wire and install a new LED Bar 3rd Brake Light, but how do I get rid of the metal prongs that are sticking through the hole? I never took off the backseat, but I know that's what you need to do in order to re-carpet the deck. Do those metal things just snap off or unscrew or what? I really haven't had the time nor tools handy to take a look for myself so any help would be appreciated. Thanks.