I have never seen so much discussion over a little screw, but I'm pleased the job went OK, and that is the way in which they often come out.
I note that the frame was of English origin, but I can't recall seeing
the
age. All English frames using English ends and dropouts, up to some
time in
the 1970s, used 2BA threads for the eyes. These are almost the same as
5mm,
but a 5mm will be tight in a 2BA, and a 2BA slightly loose in a 5mm.
More
information on BA threading can be found on the British Horological
Institute website at http://www.bhi.co.uk/
Peter Brown. Lincolnshire. England