O.K. Lets say I put my Sig LT-40 (equipped with nyrod pushrods) away after flying. All my trims are near perfect. The next time out its 40 degrees colder. I set my plane on the ground and notice that my elevator is pointing down at about 15 degrees from level, and my rudder is turned as well (nose gear is straight). I turn on my radio and plane expecting them to go back to a more neutral position (maybe they have just been bumped huh?). But nothing happens. Next I check all my trim tabs and they haven't been moved. My buddy tells me it due to thermal expansion (sounds viable huh?), so I replace them both with solid wire pushrods. I have never had any more trouble like this. Not trying to be smart here, but if thats not thermal expansion, I would like for you to explain in more detail how support of the outer tubes effects this condition.