Multipurpose ball joint

Multipurpose ball joint system that fit all my needs. Very handy !
The ball diameter is 17 mm.
Clean the edge of the inner sphere prior to assemble (gently !)
I joined a bunch of parts that I use, but some of them are probably too specific of my needs.
(Here is a probe holder that use this ball join system https://www.thingiverse.com/thing:2622171

Edit 04/05/2019 : Added 2 easy to print sets. One set have thru hole inside to allow the passage of wires. "Ball join 1st.stl" have holes insi