A pair of levers on top of the BBC box on the bridge, conning tower and control room tied to an electric and (I think) hydraulic system operated the rudder. We had a discussion a couple of months ago, and I can't remember which forum it was, and I can't find the pictures posted there, which showed it plainly.
[edit] The rudder controls were electric motor only - no hydraulics. The full report can be found here
http://www.uboatarchive.net/U-570ONIReport.htm, but still no pictures yet.
[edit 2]
Quote:
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Electric movement of the rudder is accomplished by depressing the "port" or "starboard" pushbutton at the steering station in use, employing the palm or the heel of the hand. Depressing the button closes the circuit to the magnetic controller, which starts the steering motor.
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http://www.uboatarchive.net/DesignSt...ypeIXC-S22.htm