Actually, Stronglight used smaller hex-head bolts and long shaft hex "nuts" on the 5-arm model 57 cranks. Their first use of the larger hollow 10 mm. bolts for Allen hex wrench (like Campy used) was the model 63 (around 1963).
http://farm3.static.flickr.com/
[ And, of course, they also continued to use small bolt holes for similar nuts and bolts for the chainrings of the model 49d 5-pin cranks for some time as well, before finally converting those to the larger drillings, too.]
BOB HANSON, ALBUQUERQUE, NEW MEXICO, USA
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Amir Avitzur wrote:
... I may be mistaken, but all the classic 5-arm cranks I know have 10mm Dia chainring bolts.
Amir Avitzur Ramat-Gan, Israel
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