I can send you the stl or Solidworks file if you would like? Send me a pm with email.
Not sure if that is the picture you’re asking for? Hard to really see what is going inside but there is a bearing inside the bottom cover and then one on top of the aluminum cable track. It is the sandwiched between with the bolt.
I got the idea from this 3d printer that the guy made a bearing mount so the cable chain could spin side ways. https://youtu.be/qnOci3cJapQ skip to 11:50 to see the bearing mount. This could work and keep the wiring up high.