I don't like these for elevators, they change trim too much with temperature. You will have to change many clicks of trim from first flight in the morning to mid afternoon heat. Sullivan does make some splined carbon filled rods that will help. Either way, this type of rod must be well supported or they will flex under flight loads. I have seen more than 1 plane with this setup on elevator not be able to pull out of a dive because the pushrod deflected under load. I suggest you spend the extra time and put in a rigid rod like the Sullivan with the solid metal pushrod inside a nylon tube.