Originally Posted by JohnnyO

Fixed, sort of.
Removed the bolt (M8x1.25) ground the end clean and flat, center punched, drilled #21 bit, tapped 10-32, and what the British would call a "bodge" told myself it should hold up for a few years. Ugly but it works. Thanks for all who chimed in with help.

Thanks to mod for moving to appropriate section.