I've managed to fix the left Auto-Choke and that is now all sorted.

However the Right Auto-Choke is still buggered !

Looking at where the two chokes connect to the carb, the left choke looks like this:

Whereas the point where the right choke fits looks like this:

The Bimetallic section of both chokes look fine. But it looks to me that the right choke is missing the 'arm' that is pushed by the bimetallic spring ?
I've checked that the spring works when it's fed 12v, but I can't see anyway that the spring will connect to the actual Right Auto-Choke mechanism.
I had brought another full Solex twin carb off of E-bay to use as donor parts, but this also is missing this same arm on the right choke.
Am i right in thinking that the arm IS missing/broken, and that it is just a very unlucky coincidence that even the spare choke has the same bit broken ?

Has anyone had any experience of fixing these parts of a Solex ?