Is there a tech article for rebuilding a power steering box?

many years ago... My coworker Ken was a very good mechanic. He agreed to rebuild power steering gear in a International pickup for a elderly couple who were good friends and regular customers of our shop. He took the thing apart and put it back together 3 times before he gave up. We all chipped in to help buy a re manufactured unit and get these folks double yoke egg sales business going again. My lesson learned from a distance. I'll never attempt to rebuild a power steering gear.