My mower is back together thanks to the self that stays busy while the rest of me sleeps. I realized when I woke this morning that I could defer the bolt extraction problem by sharpening the blade without removing it. The blade I had trouble with was the one nearest the exit chute and because of that, there was plenty of room to grind the blade. I just needed to be careful to do it evenly and not effect the blade balance. I started a little after six this morning and had the mower deck together and installed by noon.
I'll start mowing in an hour or so.