I found two aluminum aileron horns in my spares box. They are the tower (post) type horns. I glued them into balsa and cut the balsa into a square as shown in the photos. The aileron horn was for a 90 size plane so the screw was a bit big. I used it anyway as it was free stuff. Like you said, toothpicks would have been enough so this is 100 times overkill.

I attached a few photos of the mod but now I have removable tips .