I answered in the other thread with a pretty good account of my situation. A 3/4" worked in mine, the hole just got bigger and I just said screw it, but of course it is not as long as original and they don't sell 3/4" grade 8 bolts with threads starting at the top of the bolt(at 10pm at Lowes). ie I had to cut threads into the bolt which took forever, and then cut the bolt, final product about a 2" long 3/4" bolt. 1" is big, but probably doable if that is the last final ditch effort. I had 7/8" bolt sitting in the wings if the 3/4" didn't work. There is plenty of metal there.
But remember you screwed yourself with the T/A if you planned on putting one on. You would have to reem the T/A which I didn't bother doing.
good luck