This type of adjustable joint is often used on photographic equipment. The ones with smooth surface balls have an annoying tendency to slowly "wilt" if a heavy camera or flood is attached. The better ones have circumferential serrations on the balls and are much more rigid when clamped.
An example of what I'm on about can be seen here...
https://www.amazon.com/dp/B09C882D4M...roduct_details

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