Thanks to those who replied off list.
I believe the derailleur boss threading to be 3/16 inch, can anybody confirm that a coarse threading is likely to be Whitworth?
Can anybody indicate what the British 'standard' braze on derailleur boss threading was in around 1961?
Thanks.
Peter Tutty Londonderry NSW AUSTRALIA
Peter Tutty <peter_tutty@yahoo.com> wrote: 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
__________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
_______________________________________________
__________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com