cockney steveThere seems to be a bit of confusion, here.....
I have read your post twice and being from the metric age
( though I do have a 1958 MF 65 tractor and dont seem to have any spanners that fit it!)
i am lost
Your post does go part way to explaining why my father would always be telling me off for using his old spanners on my push bike claiming they were the wrong size
, they seemed to fit in my eyes
.
also when i was a kid hanging around the Rudge Air hangar there was a tool box marked "Dove Only"
Cheers, Dan
P.S seems like this subject could have a thread of its own!