I was removing the OEM roof rack yesterday to replace it with a new one. Everything was going fine until I got to removing the bolt in the middle section where the bolt was so tight that it stripped and now I'm unable to take it out. I tried to put some WD40, but that didn't work either. Any idea on how to get the stripped bolt off? Should I go to a mechanic who may have something to take it off? Or is there some tool I can buy for this purpose?