The steel shafts used in the Z axis are in the anti wobble mounts. They are what the bearings for the x axis wobble eliminator ride on. The Y axis anti wobble rides on the nylon pins in the same block.
I will most likely make a writeup for the anti wobble, but I don’t know if I’ll do one for the whole z setup. There hasn’t been as much interest in it . Forum user Tomscables actually put the exploded diagram in the x axis together and graciously allowed me to include it in the documentation.