Simon, I may be looking at it wrong, but I think I've found a slight error on the galley hatch drawing (and the CT hatch drawing on another thread).
The dog at the lower edge of the hatch is in the open position, as it should be for the hatch to be open as drawn. But when you look at the lever mechanism that releases the dog, it is at it's lowest extent, meeaning that the collar that moves the lever in and out to pivot the dog, is as close to the inner wheel as it can go. If I understand the mechanics of that correctly, it should go the opposite direction.
In otherwords, for the dogs to be open, the collar that works the lever should be close to the inner surface of the hatch, and when it is close to the wheel is when the dogs should be closed.
A very minor difference in the drawing, but a huge difference in how the lever mechanism works.