Ours is 10 x 0.75 mm Can have a go at one if it helps.
Hi All
Wishful thinking I expect, would anyone have a spare threaded bolt that clamps the dioptre to the rail, square bar threaded on corners that fits into the wheel.
https://imgur.com/XRjlEdr
Or tell me what thread it is ( I know it's left hand )
Ours is 10 x 0.75 mm Can have a go at one if it helps.
Sent PM