Vertex K8400 Z Axis Support

I used one 8mm mounted bearing, and 2x 5mm bolts and nuts.
It is pretty straight forward, remove the rear two small inside brackets and reuse that hardware.
Replacing the shaft coupler with a rigid coupler is optional.
This fix is to help with z axis inaccuracy due to the flexible coupler acting as a spring due to resistance in the linear bearings.

Need one KFL08 bearing
https://www.amazon.com/gp/product/B073KY11YN/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Need one optional rigid sha