I recently got checked out in a Light Sport Aircraft called a Vashon Ranger. It has an unusual aerodynamic attachment to each aileron which I am curious about what it is for. It is not attached to the very aft portion of the aileron but instead, the training edge of this piece is flat and mounted in a way that its trailing edge is close to the trailing edge of the aileron(a cutaway profile is a sort of C-shape).
You can see it in this YouTube video at 12:55 on the inboard section of the training edge of the aileron.
Perhaps assistance for aileron deflection.