I recently built a Sig 4 Star 60 and really enjoy flying it, but have noticed on warm days, that the control rods to the elevator and rudder expand causing changes to the trim settings. The control rods are plastic.

I don't have the problem with the ailerons because they are steel rods.

My question is: can I replace the plastic rods with steel 2-56 rods without causing a interference problem with the airplanes receiver? I imagine that steel control rods would solve the trim change problems.

Thank you.