I bought a steering box skid plate and am having a hard time removing the bottom bolt to install the skid. Squirted Kroil on the threads over several days. I first tried a socket wrench with no success. Tried an impact gun with no success. It is a hardened bolt but I don't want to risk snapping the head off by using a breaker bar. Thought about using heat carefully but don't want to go any further until I hear from someone who has done this successfully or has info. Thanks in advance.