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@Brucy
^ i know all this, BSA is 1.37" = 34.798mm x 24tpi, Italian is 36mm x 24tpi in metric 36mm x approx 0.9449mm, the soveit thread is 36mm x 1mm.
I built one up the other day chased the threads with my phil italian cups and hey presto it works perfect. I knew when i bought it that it wasnt going to be standard.
its not French or Swiss which are pure metric.
its a special ruski thread.