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Triumph winged adjuster for unit construction twins.  These adjusters appeared around 1960 and were used until the UNF version took over from about 1968 onwards.  Select your required variation.

• 1/4"-26TPI BSF, 1960-68 (F4585)
• 1/4"-28TPI UNF, 1968-70 and later BSA's from 1972 onwards (82-7387)