Harvey and others with queries re. Stronglight cranks should consult our own Robert Broderick's superb contribution on the subject on the equally superb (and boy is it ever!) Classic Lightweights UK site:
http://www.classiclightweights.co.uk/
Totally unrelated, you might also check out the just posted and outstanding piece on cycling in Durban, South Africa in the 1950-70s.
Peter Kohler
Washington DC USA