So, I am looking for a bottom bracket axle to use with my existing cups.

It would be nice to find a used TA or Stronglight, but they don't seem to be too common eBay.

So, I was considering a Campy since they have the ISO square tapered ends that I need. Except that pre 78 spindles are slightly smaller, but things can be shimmed if necessary.

IIUC, I would either need a Campy for 68mm with thin cups or a 70mm for standard cups (giving 1mm more offset when used with 68mm thin cups).. I need an axle with a 132mm effective length -- actual length being the effective length - 2 x the offset.

And now the trouble starts. IIUC, an axle marked 68-SS-120 is NOT 120mm long. What am I missing here? Is there a site that can decode this?

However, I have some question as to whether Campy made a long enough axle.