This is a replica display armature for a puppet in my animated short film, Creature Feature. I used a Matsuura CNC milling machine to manufacture all of the joints from 6061 aluminum. All the joints are of the same design, just at a different scale to hold either a 1/4", 1/2", or 3/4" 316 stainless steel ball.
I came up with the design after a lot of R&D, including one earlier prototype that used hose clamps instead of screws, but that proved to be bulkier and harder to adjust. This universal joint has a few unique touches that I came up with and am quite proud of, including a 0.005" lip that keeps the balls from popping out of the socket at any extreme angle.