Another option, instead of using the wire pull-pull is using the sullivan Gold-n-rod like the wire. I am using this on my GP Extra .60 with great success. I am using the "blue/yellow" rod.

It works great, easy to adjust, probably almost as strong as wire, lightweight, and easier to setup than wire. I am a big fan. Depending on the plane, I would recommend a digital servo on the rudder. I have one on the Extra and as soon as I can afford it, most all of my servos will be digital. The one on my Extra is a super fast/high torque and when you snap it up into a knife edge, it stays there, regardless.

Try out the gold=n=rod, it may work for you.

James