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However, CEI would be obsolete by this time and the 20 TPI series was discontinued after CEI had been adopted into British Standard, (CEI becoming British Standard Cycle thread in 1938), therefore, 5/8" x 20, also 9/16" x 20 at the other end of the mainshaft, also the nuts could in fact be 55° special Whitworth (Whit Form) and not 60° Cycle thread.[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/bsw-unc-caution.35900/post-595194[/URL]
However, CEI would be obsolete by this time and the 20 TPI series was discontinued after CEI had been adopted into British Standard, (CEI becoming British Standard Cycle thread in 1938), therefore, 5/8" x 20, also 9/16" x 20 at the other end of the mainshaft, also the nuts could in fact be 55° special Whitworth (Whit Form) and not 60° Cycle thread.
[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/bsw-unc-caution.35900/post-595194[/URL]
