"John" wrote in message
...


PS. I did the same 'project' as part of my engineering apprenticeship in
the late 70's


That's a project?
I had to file a gauge to 3thou and then make a "c" clamp from a square or
metal 1/2" thick including turning and threading the screw for my O level.
I didn't realise engineering was being dumbed down like the rest of the
GCSEs these days. ;-)