Thank you gentlemen (minus one),

The BB shell has the serial number, as well as the Nervex lug id, so I'm loath to go that route.

I have three FD's from which to choose. I have a nice Mavic FD, plus these two.

None have cable stops. Even the Mavic is just too modern. The period-correct would have had a cable stop, but I'm building to what I have and like to use.

I had a nice old Campy clamp, as suggested by CapeCodder. Naturally, it broke. I think they can be spread maybe three times. I suspect this one was past that number. So, I guess I'll have to track down another.

An old frame from the 50's, located in England thru intermediaries. Very few of these exist. Refinishing was easier and much cheaper in England. Small details to sort out. Using the clamp is not a major impediment.

Thanks.