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A model made in 2010 that I uploaded again in 2018 (because asked by someone seeing the video).
The two parts are indentical and interlocked.
The joint is very original.
Can contain a sphere of 22 mm of diameter (don't ask me why).
Video shows Stainless Steel, but this material is no more available for interlocking pats, sorry: for metal, try copper, brass, bronze or silver instead.