X cable end detail, notice the little brass ball on the end of the cable.
Also at the bottom is the X cable routing.
The double pully in both X and Z axis reversing loop are what give it zero backlash.
This axis was loose, there is a screw on the bottom side of this drive that can back off and cause the spindle to tip in. If the cable keeps popping off the top, this is a likely issue. The Z axis spindle in the previous picture is how it should look.