I don't think there is any rebuilding hem other than replacing seals.
Possibly something has gotten inside it and is locking it up. Nothing to loose by opening it up and taking a look.
If something is broken it probably can't be fixed if internal, special parts are needed. If something shed metal the system will need to be flushed.
BUT! Be very careful, mark the locations of EVERY component! Take pictures, scribe and mark the position of the covers and everything in between. It will go back many different ways, but will only work when everything is correct. Get it wrong and it will do strange things!
As for using the other unit, it might work if it will plumb and mount. The steering might react different, probably slower.
Just be careful, they can shake the wheel violently, spin the wheel, or send the steering to full lock. Keep your hands clear, expect the unexpected until it has proven it can be trusted!
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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