Starter bolt#*$)(#

Don't be afraid to BEND a wrench, what are they, 5/8? Buy a cheapie, or take one of your rusty spares. Believe it or not, years ago, I've bent 1/2 and 9/16 with a PROPANE torch. Yes, it takes awhile. Put in the vise, get into a comfortable stance, ready with a pipe, vise grips or other leverage device, and heat away.