Hey Toothfish,
The first bolt I took outta there was an M8 x 1.25 pitch. Couldn't find that in grade 8 and I looked in 3 different hardware stores that have nice selection. Tried stainless as I thought that it might be a little harder. Actually took the auger in to make sure of the size because the far side is tapped as oppose to passing through and using nylock nut. Just got another one at my local HW shop and when I get her runnin' again I'll see how that does. Thought M8 was weird because I thought Strikemaster was US built???