Nah, nah... just buy the Sugino french cups from Harris, take out the SL cups, stick on the Suginos, and find an acceptable older Japanese crank and spindle with a more common BCD (like say, 130). That'll avoid having to find the old "five" Japanese spindle, plus give you more chairing options, as the 122 SL BCD is getting uncommon. Be sure to crank the fixed cup on tight!
Not all Campy will work; some Campy cups are thick walled, where the SLs are thin walled; so the Campy spindles won't always work with SL cups. Vintage Campy and SL spindles are different. The cups and axles aren't really compatible (although you can mix 'em in a pinch), and there is a difference in the taper as well. Vintage TA spindles will work w/ SL cranks (exact match), and vintage Sugino Maxy, but for the Maxy you'll need different cups. For reference, check a period Sutherland's Handbook for Bicycle Mechanics.
There isn't anything wrong with converting a PX. They're so braze-on free that you don't have to hack anything off. I own three of them (1967,1972,1973, with the 73 a conversion). Easy enough to take back to standard, so what's the issue?
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Last edited by Poguemahone; 05-04-06 at 06:10 PM.