Saving Old Seagulls

Can anybody tell me the thread & size of the flywheel nut on an Anzani 1.5 Pilot
I am trying to help a friend in Finland to rebuild one of these and the nut has gone
AWOL

Thumbscrew thread size is 7/16"x14tpi Whitworth.

Many thanks for your reply I will measure pitch and diameter over the weekend.
I would realy like to clean the threads up as I have 8 decent carb bodies that
are realy to good to scrap

Can anybody tell me the thread type and sizes on the Seagull-Villiers carburettor
I think the fuel banjo thread is 1/8"BSP, but no idea what the other two male threads are
i.e air inlet & top screw ring on throttle barrel