Hi Mike,

In your post when you say "wires", are you using ridged wires or a flexible cable? If using ridged wire you might want to replace it with a flexible cable system. Forget all the geometry about working out your pulls. Replace your servo arm with a cable pull-pull wheel similar to that as mfg. by "Hanger 9" and others. Run a continuous cable from one control horn (or linkage) around the servo wheel to the other control horn (or linkage). The slack is taken up at either end. Follow the directions with the servo wheel by using the clamp screw to keep the cable from slipping on the servo wheel. Simple and very positive in either direction.

Roger

ps
It should be noted, that it is still a requirement that the control horns be on the hinge line.