Simon.
Crossovervalves.
A small detail. I guess the valve spindles are a bit longer and it might be an universal joint between the spindle and the extension rod if you can figure out the details on the photo below.
Tore
I think you are correct, Tore. I rechecked my photo's and it look like a universal joint top & bottom of the spindle. I wonder if the Germans did this allow a little bit of movement when under depth charging
I just checked the length of my spindle and it was 535 mm I would not imagine then would be to long, but I do not know for sure.
I will update my drawing again in the morning
I was thinking today it would be great to see a current photo