Anyone have any or know where I can buy them, all I can find is packs of 10.
Managed to grind the back of mine down and it no longer locks properly
I use metabo hikoki and dewaltDoes the required nut screw directly onto the spindle of a machine? If so, what machine?
Describing the requirement as "3M retainer nuts" is too vague for us to understand what you are looking for.
The pack-of-ten 3M ones are all imperial thread, meaning the Wolfcraft one above, which would be M14 thread, for a standard grinder, might not fit.
I use metabo hikoki and dewalt