I was taking out the rear bench seat on my YJ a couple weeks ago to prepare to bed line the inside of the tub. Well, one bolt came out cleanly, but the other three.... well, the bolt heads broke right off!
I have no idea how, because I wasn't applying a whole lot of pressure, and the bolts don't seem to rusted out through the core at all.
I have already tried drilling out the center with regular drill bits (i am thinking of drilling those out and re-tapping the hole) but these bits aren't making any progress at all (in fact we broke four of them), which makes me think that they may be grade 5 hardened steel bolts.
I read that diamond tipped grinding bits (made for a dremel) will turn them to dust in 5 minutes...
what do you think I should do?