Managed to squeeze in and get a more direct shot of the uncouplers working. Also a shot of a "Mk II" control rod working the lifting ramp.
The rod is longer and has a curve that levels back to a horizontal plane - this results in a gentler lifting of the spherical pinhead.
You can see a MkI rod in the background, they work well but there is very slight resistance sometimes because they "push" the pin rather than guide it.
I also added a third hinge barrel along the length of the shaft, this minimises bending in the longer brass rods.