The drag link has a ball on its end where it goes into cylinder. When the ball moves in responce to the steering wheel, it pushes the spool valve in either direction. When the cylinder housing moves, it tries to center the ball so that power is stopped. These cylinders are available as aftermarket items. Search on tractor power steering. Below is an example but there are others as well. I think they cost around $400-500.
If you went to a hydraulic house, they might have a similar servo system in different sizes and capacities.
This post was edited by Wardner at 10:59:39 02/18/10.
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