Originally Posted by
vasek
+1
just be aware that one cable (outer) will go a little slack when rudder is deflected & that's normal. Don't over-tighten the system.
Cheers, V.
Whether one line goes slack or not depends on the geometry of the servo arms/rudder horns. It's called "Akerman" geometry. Here is an explanation:
http://www.qmfc.org/school/ackerman.htm