Using a sharpened piece of brass tubing inserted into a cordless drill, holes were cut through both elevator halves and the rudder, matching the diameter of the hardwood dowel that was inserted and glued in-place. I use as large a diameter dowel as I can find at the time needed (usually 3/8 or larger). The dowel is cut and sanded flush with each control surface. An ice-pick was used to make an indent in the center of the dowel, prior to the 4-40 pilot hole being drilled and tapped. A 1 1/4” 4-40 bolt and Dubro nylon horn were epoxied into the dowel, forming each control horn.