This tutorial is actually an update to a tutorial I did quite a long time ago. Back then I didn't know about editing and decided to make an update. We cover how to make a rig that is a working universal joint.
as much as I wanted to do this tutorial in 2.8 i did discover a known bug regarding armature visibility, at least on windows 10. So for the time being I'd actually recommend using 2.79 for this tutorial if your also on windows 10