Since Benchtop Precision is no longer offering G0704 bearing carrier or belt drive kit, I would maybe try to make one for myself. I do not want to tear down the machine yet since it is working ok for now.
Perhaps many other users already upgraded to new belt drive kit and can tell me the dimensions of lover OD (35mm), upper OD 45mm) and the length of the original bearing carrier including the dimensions of 6 spline shaft holes on the bottom.
Attachment 399578