Update: please note that this posting and some other postings related to this approach to turnout controls are published as originally posted although I've since removed this solution in favor of another approach documented by newer notes. Ultimately, I determined that I was unable to successfully adapt this control system to Z-scale.
Another modification that I've implemented with the Hump Yard Purveyance controls is shown here. One thing I didn't like with the first few levers that I installed was how the wire seemed to bind or get laterally stressed as I moved the lever in the direction where the wire is pushed furthest into the teflon sleeve. To relieve this stress on all of the remaining levers that I'm installing, I've modified the shape of the wire where it is attached to the lever ... in these images you can see the hook shape that I now use (as opposed to the simple 90 degree bend shown in the lever instructions). These hooks now allow me to position the wire on the lever such that the wire moves smoothly in the sleeve. Before, the wire was pushing the lever sideways and making it harder to change the position of the control.
Now I am working on installing all of the remaining turnout controls. Once I have that completed, I'll have one more thing to share about installing them as I've got two instances in the layout where a single lever will be controlling two separate turnouts at the same time.