Nick,
You're in luck!! I made the reverse of your conversion on a new Campy 126mm hub right after the 120mm were no longer available. The entire new axle assembly has been in my spares box for 20+ years.
Contact me off-list if interested.
Pete Imandt Ramona, CA
> Nick Zatezalo wrote:
> I have a 120mm spaced Campagnolo rear hub and need an axle to convert it to
> 126mm spacing. Excellent to NOS considered.