Help! Help!

I am working on my 1980 450sl and last night I was trying to remove my steering wheel to get to my instrument cluster. After 3 trips to Lowes, I finally got the 10 mm Hex Wrench that I need for the hex bolt keeping the wheel on, but for the life of me I cannot get that bolt to break. I'm at the point where I don't want to try to too hard b/c I'm afraid I may damage the wheel or components with too much force.

Has anyone had this problem, and does anyone know anything that may help me get this thing off? I assume that it's just a regular hex bolt, it's just in really tight, but that it is threaded like any other bolt. Is this true?



Thanks!!