I used to have a spray boom that was made with a pipe-in-pipe swing joint with the bearing surface on a bias. It had a spring inside that gave it the necessary return effort. It was a slick setup. We also had a pipe-in-pipe swing joint that we made by capping the internal pipe and adding a handful of ball bearings on top of the cap slathered in grease.
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I used to have a spray boom that was made with a pipe-in-pipe swing joint with the bearing surface on a bias. It had a spring inside that gave it the necessary return effort. It was a slick setup. We also had a pipe-in-pipe swing joint that we made by capping the internal pipe and adding a handful of ball bearings on top of the cap slathered in grease. 
