I need to get a bolt off my car which can only be undone from the top, but has siezed, and no amount of plus gas/wd40 seems to be able to penetrate. I can't get a socket on to it becuase there is no room, I can only just get a ring spanner on it but do not have enough leverage to move it... any suggestions? can't get nut splitters in there either, or anything that could cut it off. I have a replacement bolt so distroying it is an option but how?