The biggest mistake most new users of nyrod make is to have a long unsupported end between the exit at the rear of the fuse and the flying surface. If you must have a length that you cannot tie the outer case to within two inches of the elevator horn, insert a long wire into the end that exits the fuse. This is not as simple as it sounds, the wire must be integral with the part that threads into the clevis. You could use a very long threaded rod but that poses problems of getting it screwed very far into the inner nyrod. Just make sure, that whatever you do, the part exiting the fuse will not bend under air loads. I have seen where people have put a 1/16 wire all the way from the servo to the flying surface using the inner nyrod as a guide only--this does work well--with the clevises soldered to the 1/16 inch wire..