This is getting more puzzling. Thank you evert. I tried M% but it was too big ... pity as I have a lot of them.
I am wondering if the best solution is to strip the action and re-tap the thread.... and put a nice screw in place.
Cheers, Phil
At the same time ... if someone has an electronic version of the Owner's Manual, I would be very pleased to have a copy.
Cheers again.