That answer prohibits crossed wires!
Search for Ackermann principle, and you will find an article of my good friend Brian Felice. Not exactly Ackermann, but close enough! (sorry Brian!)
It is not possible to get equally tight cables in all servo positions when the cables are crossed over.
aving said that, in many situations one can ask:"who cares?" because the aerodynamic load always tends to strain one cable only, so cable slack outside neutral is a non-issue in my humble opinion. I will don my armour just in case. Maybe someone will convince me of my errant ways.

PS, the link is: [link=http://members.cox.net/bdfelice/Pull-pull/pull-pull.htm]Ackerman[/link]