Donald Gilles offered good advice, but I'd personally add one thing. For a wheel that I plan to ride, I'd rather have a slightly undersized diameter (lets grease in) than a lathe-cut cone. Campagnolo record cones were ground and polished, for a real quality surface, and I've rarely seen them pitted. In contrast, the less expensive cut cone surfaces on many French hubs tend, in my experience, to develop pitting.
harvey sachs mcLean va. ++++++++++++++++++++++++ <snip>
A third option is to replace your M10 x 26 tpi axle set with an M10 x 1mm axle set from Taiwan, there are many generic versions of these axle sets for less than $10 that probably conform to campagnolo specifications (the main thing you need is a cone that's not too wide in diameter, placing the bearing surfaces at an angle that is reasonably close to OEM campagnolo, since axles flex and the cups have a circular radius to accomodate flexion in the axles, so the angle of the bearing cone can be different.)
- Don Gillies
San Diego, cA, USA