Thanks, I did undo the bolt; I can only seem to get about an inch of extension, basically just enough to read the inscription on the coupler. Since there is a cross tube just above the coupler, and the front arm 90 degrees away, there isn't a great deal of elbow/wrench room. I am considering buying a deep well socket that would match, as the the current location looks like a knuckle buster.
I sent photos to Terry, but I haven't heard back from him yet. From the numbers that I can see, it looks to me like it is a Stucchi adapter, which matches everything that I have here at the moment.
I haven't gone back to the engine side to see if there is more slack there that can be fished forward. Has anyone fished it back to the fire wall and worked on it there?
What seems weird to me about the fracture is that it is on the outboard side, which is where the metal of the lip should be in compression. Naïvely, I would have expected the fracture on the other side of the lip. The fracture is bad enough now that you can catch the edge on your finger as you run it over the top, about a half a millimeter or so sticks out that is hard to see in the photos.
All the best,
Peter