How much space between cables is enough?

Cable Elevators are ceramic insulators commonly used on telephone poles. The top has a cradle or saddle shape with the cable normally laying in the saddle. Yellow rubber bands are stretched across this saddle. The rubber band stretches and supports the cable just above the saddle. There's not a lot of space, but if you look at the earlier photos you can see the cable is resting down more in the saddle. They don't have free range to bounce like the speakers but the bands do hold the cable away from the elevator leaving it free to vibrate on its own. 

The cardboard tunnels are PPT eMats cut and shaped into tubes and painted with Taytrow TDF.

You fellows have way too much free time!

@millercarbon

What is Taytrow TDF?

But doesn't that make the material and design of the elevator somewhat irrelevant? The principle focus is to have the cable suspended by the rubber band.

Rubber bands not the only thing that rots.