Triumph/BSA Clutch Spring Nut for Pre-Unit and Unit Twins. Made in the U.K. by O.E.M. manufacturers. Cycle thread clutch nuts. These can also be used to replace the early brass nuts, PN# 57-0427.
Triumph: 350/500/650/750cc pre unit and unit twins.
BSA: Early A50/A65 models + A and B Group models with a Triumph type 4 spring clutch.
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