We finally got one of them apart. We practiced on the broken one, before tearing into the one I actually wanted to fix. Good thing, too! As we were pulling the shaft out, several additional pieces flew out that neither of us was expecting!
So far, we haven't figured out how they go back.
I've been talking to retired mechnics. They all are familiar with the valve, but either have never had one apart, or it's been so long that they don't remember how it goes either. I even called Eaton, who owns Char-Lynn now, and they never heard of it!
The no. of the valve is #960. I also found a copy of some old advertising literature which lists it as a V-960.
R Aiken, I may be interested in one of yours if I can't get mine resolved.
I guess I'll keep trying, and I'll keep you posted.