Try http://www.namrick.co.uk they are my go to for anything threaded
Thanks for the tip .. currently the frame is with a local engineering workshop...who is an active cyclist...he is retapping the thread to take a metric bolt and he will use a stainless steel bolt...plus it ain't Whitworth!
@marxist_vulcan started
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Try http://www.namrick.co.uk they are my go to for anything threaded