RE: Four star build
Nope-He has the 40. From what I understand it comes single servo and that is the way he is building it. That means torque rods, not horns. If he was dual servos, then he would have horns.
Chad, unless you go dual servo, I can't think of a way to use control horns as you must have a way to translate the motion out to the ailerons. BEFORE you mount the ailerons you must make decision of single or dual. You can convert to dual later but it is more difficult to put the torwue rods in after the ailerons have been mounted. The threaded part is where the aileron linkage attaches to the torque rods for adjusting.