B31 Magneto Puller size?

[Fraz]

Can anyone advise what size and thread pitch, the magneto puller tool needs to be, for a '54 B31 please?

I may already have one that fits, from my vintage moped collection.

Thanks

[Bigsingle]

Hi , I looked it up and made mine a while back , but just looked this up  for you , hope this helps .  From British only Austria
Magneto Pinion Puller. BSA. A7. A10. M20. M21. M33. B31. B32. B33. B34. Gold Star.

A7. A10. Sutable for manual advance and retard drive gear.

5/8" OD Thread. 20TPI

[Roy]

My ones 11/16 x 20 tpi
Roy

[Bigsingle]

Yes , Roy is correct , I just measured mine ,
11/16 as a decimal is 0.6875
Unable to change my previous post that was copy and pasted from British only,  maybe the parts person couldn't read the vernier ,  I think that is about 17.4mm . Cheers .