I've been blessed!

[old_tv_nut]

Thanks for the advice. I popped for the vac-seal. Scotty looked at the tube and thinks the face and neck seals look OK - he thinks it most likely that the leak was at the metal evacuation pinch off. Of course, there is no guarantee, which I fully understand, but I am willing to risk the cash based on a reasoned examination. If it doesn't work, it's back to looking for a dud under vacuum.
I think everyone involved has their fingers crossed!