the best way I find is that I use a 4-40 bolt and lock nut to attach my pull-pull cables to the rudder form the rudder servo. I use a 4-40 bolt that is long enough so that I can use two dubro aileron horns on the end of the 4-40 bolt ( they are the kind that are on the end of your aileron arms on the inside of the wing on your typical trainer, creates a pull-pull for the ailerons on the inside of the fuse). They screw onto the 4-40 bolt at the bottom and have a place where you can put a pull-pull wire through them. I then attach a second pull-pull set-up from the aileron linkage to the tailwheel. works great.

Pete