swingarm removal

I have a bolt and a nut, one is 19mm if i recall correctly and one 17mm on my 77 650. What gives, I think I blew something trying to crack the nut, is there something I am missing? Considering the torch..

That should be it. Try tapping all the way around the nut with a hammer to crack it loose. I'll look in my stash for an extra one in case you need a new pivot bolt.