Hi!
A pull-pull system using thin fishing wire is the best metode to transfer motion from the servos to the flying surfaces. It also hinders vibration from the flying surfaces to go back to the servos destroying the potentiometer and electric motor. A pull-pull system is perfect for elevator and siderudder and is very easy to set up and weights little.
For ailerons this set up is not recommended as it is to difficult placing the wires inside the wing and having them take a 90degree turn to reach the ailerons.
Here a servo at each aileron is more feasible...or a having a single servo controlling both ailerons via an ordinary piano wire torque link system.
Here is some pictures from my Great Planes GEE BEE R-2 where I use wires to control both elevator and side rudder.
The drawing depicts the elevator linkage made up from a piece of black coloured, Easton arrowshaft (6,3mm thick) and a 100 mm long, 3mm pianowire and two 3mm allen head bolts (with heads cut off). The lenght of the pianowire makes the elevator very stiff.

Regards!
Jan K
Sweden