Does anyone know what is the size and type of thread for the drive end of a Lucas MO1? Specifically it's the tread that holds the magneto clutch onto the shaft.

When I looked at this thread a long while back I concluded it was a 'bastard' thread as I was unable to identify a specific thread that matched it....

If anyone has managed to tie it so a specific thread series I'd be interested to know the result...Ian

email (option): ian@wright52.plus.com

I have got it measured as 32 TPI.