Thanks to each of you for your help. I have a 1/2" stainless rod that I was thinking of using because I thought the original was steel. Aluminum would be easier to work. I have the 2 mounting clips at the bottom of the amp, but the 1/2" rod didn't seem to seat too well, so I thought the diameter was smaller. How far from the end and what diameter is the compression ring?
I've read a lot of everyone's posts in other groups, and I've found them invaluable to repairing/restoring my Ampegs. Thanks to all. I have a '64 B-15, a '65 B-15, a '66 Gemini I, a '70 Blue line SVT with '73 straight back 810 cabinet, and a '76-'77(?) V-2. I think I need to join some of these Ampeg groups... or get some therapy???