Magdyno shoulder nut (Long) for BSA B&M group magdyno drive pinion on A7, A10 B31, B32, B33, B34, M20 and M21.
Bought in so not to our usual standards but it does the job.

 

Had a zinc plating with a clear passivation

BSA Mag Dyno Drive Pinion Nut (Long) A7 A10 B31 B32 B33 B34 M20 M21 24-0195

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