Hy 50long150GMC5w, I'm no metalurgist (spleling) but those look like clean breaks to me, not a constant wearing type thing, but rather a shock type break, As I said in my post yesturday, I can't think of any kind of load that could cause that break that wouldn't also show other damage. It's a puzzler all right, breaks can begin from holes, but I see no evidence of a fatique break. Please keep us informed.
