i'm almost betting the cut marks allow the bolt head to deform somewhat, affecting the clamping force.
From the Earnest technical bulletin that "Darkbreeze" linked.
thanks for kicking my butt when i needed it Jim !
after reading the bulletin, i immediately forgot what i read ! i need to get some of those supplements advertised on late night tv.
i think those products are meant to kill the spiders that make the cobwebs in my noggin.
i have now printed the bulletin, so i have no excuse to forget what it contains. [except forgetting where i put the print out.
]
