RE: Horns
Make your own with 4-40 bolts , blind nuts, and aileron horn brackets (DuBro #557). Drill a hole thru the control surface, screw a blind nut on the bolt with the non spike side toward the head of the bolt, put the other end of the bolt thru the control surface, and screw the other blind nut on the end of the bolt and sink the spikes into the control surface. Then screw on one of the aileron brackets to connect the clevis. You can also get a simular system already set up and heavy duty ( 6-32 bolt ) as DuBro part 867.