I converted a Senior ARF to a taildragger. I used 2-56 pull-pull from the rudder servo to control the tail wheel. I used the SIG-provided balsa dowel for the pushrods.

On the Senior kit that I just completed (8 1/2 lbs) I used arrow shafts for the pushrods and a Hitec HS81 servo mounted immediately in front of the tail wheel assembly. As this Senior will see floats the servo will easily double for controlling the float rudder. If not for the float mod I would have used the pull-pull technique again.