You can mount the elevator horn on bottom or top of the elevator. A longer control horn can be used when mounting on top of the elevator.

The horns are made from music wire, sheet brass, a couple nuts, and silver solder.

A Dremel tool was used to grind out the area for the elevator horn.

Note that when the horn goes on top the gap-less hinge is located on the bottom of the control surface. [8D]