That looks horrible. I'm obviously not explaining this at all well.

To put the screw in tension you just need one angular contact bearing at either end. The Bellevilles try to stretch the entire screw end to end. Adding more bearings just gives you an alignment nightmare. There is hardly any side loading on the screw to worry about, so don't worry. I used one bearing at either end of my overlength X screw and it was fine and dandy.

I used a pair of bearings at the handle end of my Y screw simply because I couldn't fit any bearings at all on the far end.

Not a problem for the X so I put one bearing at either end.

The whole she-bang should be sloppy, right up to the moment you tighten down on the Belleville's.