Your description is a much more precise way of looking at it. I was trying to reach for the same concept when I talked about fluid dynamics and the forces acting on the head cancelling out so that it rests at exactly the right distance, but I lacked the clarity to state it so neatly. Thanks!

>>> It is exceptionally challenging engineering. <<<

It's also very beautiful... When you look at something like that it's a bit like looking at a work of art - I don't know how to explain it but it is awe inspiring. I wonder how people end up working on such things... How do you get to the point where you can raise your sleeves and create a system as beautiful as this?