4 x M3 Threaded bar x 100mm
Lengths of M3 threaded bar can be used in combination with Anibild M3 threaded ball joints and singular balls. Cut threaded bar to required lengths, clean ‘bares’ away with a file and screw into threaded balls with thread-lock or similar.
Neat little rig. Bought it a few weeks ago and only recently got around to setting it up. Bought a few extra threaded bars to extend the length of the arm. A photo of the rig in use has been posted on StopMotionAnimation.com. Try "Raven Project" to view.