I am on revision 3.0 of my design for the diagonal rod ends that I was working on. They should fit into the end of some chopped off “sturdy stake” and fit the metal U-joint for a Rostock Max. Best news of all, these are SCAD designed. I have included the SCAD file. I have not test printed and test fitted V3 yet though.
V3.0 needed sanding inbetween the prongs. Added some more space between them, rounded some things out a little more and enlarged the peg just a slight bit. V3.1 is not tested, but is posted.