you will need a wooden dowel. the dowel will be your push rod. At one end of the push rod you will drill two holes through the dowel about 1/4 in apart vertically. into each of these hole you will insert a small length of solid metal push rods with the threaded connector on the other free end. the end that is inserted into the wooded push rod will have been cut to length bent 90 degrees so that as it fits into the hole the rest of the pushrod will flow down the wodden pushrod. theses two metal pushrods should end up fairly equally in length and should extend far enough from the wooden pushrod so that they can be attached with no stress to each of the elevator control horns. Securing the pushrods to the wooden pushrod has several options like wrapping wire or dental floss that has been glued to the metal and wooden push rod. just wrap from before the metal pushrod enters the wooden one until the bottom of the wooden pushrod is reached or you can use my favorite method of using shrink wrap to secure the pieces together. The other end of the wooden pushrod is similar except you are only using one metal pushrod to attach to servo