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Two popular popular subjects tn the tech section threads! Here you go. The transmission lube thread has info on the axles as well.
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alove, give these guys a call. https://www.midweststeering.com/ They have a lot of steering gear knowledge.They have a lot of tech about all types of steering gear. This TRW/Ross box diagram from...

Epoxy would have been my thought also. I am assuming you are talking about the tube the horn wire goes through. I would try Brake Line tubing. You may be able to make another one out of it. The epoxy...