Control horns are the plastic pieces where the pushrods push and pull on the control surfaces. I like small, light horns that snap-on. I also glue them on for safety.
My favorite horn so far are the Light Weight Horns sold at HobbyKing. They are very small, about 17mm high from the base, snap-on with two pins and hold on tight. They have three position holes for the clevis.
Since I found them I have used these in all my foamies, including the Park Jet and Super Cub (ailerons). I would only recommend these for small and medium-sized models. For larger models, a bigger, stronger horn might be better suited.
