Joined: Feb 2012
Posts: 19,381
Likes: 5,528
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
If we're talking about the Campy hubs which were available for a few decades up to the mid 1980s (I believe Record is the name but most will refere to them as Nouvo Record) then the axle for a 126mm frame width should be about 135mm long to insure enough axle/drop out overlap. The ball size is the almost standard 1/4" and 9 per side.
Wheels produces at least three 10mm x 26TPI hollow axles, #8, #9, #18. They vary in overall length. They all are longer then your needs are but a hack saw does a fine job of fixing that. They all will likely cost $25 to $40 in your LBS. Consider this the cost of using that spec. Only a few years ago the same axles would have cost about 1/2 as much.
Down here in the States the LBS supplier, Quality Bicycle Products, stocks these axles and any shop that has an account with them can source an axle. Other suppliers likely also stock these axles. Don't know about Canadian shops and suppliers though. Andy