BSA unit single clutch spring nut, drilled for lockwire

Fits

BSA C15 B25 B40 B44 B50 and 

Triumph TR25

Tiger Cub etc

Bought in, been zinc plated with a clear passivation

BSA C15 B25 B40 B44 B50 Spring Nut 41-3215 57-2748 57-1146 40-3219

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