Originally Posted by
hoistop
Many thanks nodrama for your effort!
I understand this system is a classic follow-up mechanism.
eee... I am still confused a bit. Would that mean that control shaft itself is actually a hydraulic piston with attachments on both sides??...
No, Fig 3 in the bulletin shows the control shaft (in red) as a separate component that passes through a hollow piston. Description in the text also describes this. No detail given on how the piston acts on the control shaft.
To muddy the waters, the same figure also indicates a mechanical link from the control cable to the spider, but a number of posts have said it can't move without the hydraulics.