Fastener sizes on SU shafts

["jonmac" <jonmac@ndirect.co.uk>]

These nuts are either 2BA or 4BA. I've got a little double ended ring
wrench which is about the length of my little finger. This is the one I use
for adjusting all SU carbs.
It's a peculiar British size (and while I could be wrong) it was very
popular in my youth with model aeroplane engines. That's the size, whether
you will find one easily in Greece, I can't say.
John Macartney