Is it spinning on you? If so, yes, cut a hole so you can get at it. It isn't a nut that you put a socket on...it's square in a cage, what happens is as you turn the bolt, the corners spread the cage (if it's frozen) & allow the square to spin. Most of the time once you cut a hole, heat the square with a torch & it should come free. You may need to use a pry bar or vice grips to hold it from the top. Good Luck, Lorne