Buy yourself Sullivan Gold-N-Cable #508 .056" Multistrand cable they come in different lengths, also buy Great Planes 2-56 Threaded Ball Links, you have to do some simple soldering. The instructions comes with it how to install the balls links. This is the best setup that I found with the Avistar, the cable is flexible enough and yet gives you positive response on the Throttle. If you have never done this kind of installation find out what your buddies are doing. But this setup is widely used in most sizes.
I've used the same idea on my Easy Sport 40, and I'm going to use the same on my Waco Bi-plane.
My Avistar is an ARF. Let me know if you need more explanations.
Regards
Garthwood