I'm starting the build on my 1961 Dawes Dorado, which I obtained as a frame and fork complete with headset.
This particular frame features a brazed on derailleur boss (rear derailleur only) and I need information on the possible threading. Thread I imagine would be imperial of some sort, threads do not appear damaged.
It's definitely not the modern M5 metric and I did try the bolt from a circa mid '60's Cyclo shifter clamp that appears close to the diameter, but the thread itself is different.
Suggestions/ideas (Whitworth?), as to possible boss threading, so I can obtain some sample bolts to try for fit - will be used on a period Cyclo shifter.
Peter Tutty Londonderry NSW AUSTRALIA
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