snipped: Chuck Schmidt <chuckschmidt@earthlink.net> writes: "My circa 1954 Bianchi Campione del Mondo has the dropouts you describe above with the larger 4 mm screws. I never even noticed."
e-CHUCKIE
the 52 Bianchi Tour de France that i restored for 'Nick' a few years
ago had these larger diameter adjusters. the bicycle in question was
mildly debated on list after it ended up on ebay.
e-RICHIE
Richard Sachs Cycles
No.9, North Main Street
Chester, CT 06412 USA
Tel. 860.526.2059
http://www.richardsachs.com
http://photos.yahoo.com/