A friend recently gave me an old Atala frame painted in Repsol colors.
http://www.flickr.com/
Perfect for a "fixed" gear.
I threw the bike together using whatever was an hand, and a freewheel, hoping to replace it with a large single cog + lockring.
It turns out that I had an old 22 tooth TDC cog that should work ... but doesn't.
The first problem was that the threads weren't round ... so I took a British threaded adjustable cup, and ground some slots into it, converting it into a home-made tap. Then I re-tapped ot the threads.
I got to the point where mounting the cog on an old british steel hub went smoothly.
But the cog still won't screw on a Campy hub with ITALIANA 35 x 24P threads.
I do not want to mess with the hub threads. What can I do?
Amir Avitzur
R"G Israel