I have sullivan Gold'n' Rods installed in a plane and had the trims neutral with neutral control surface deflection (rudder and elevator).

Yesterday was a warmer day than recent days have been and when I took off the plane climbed steeply. It took almost all of the available downtrim to maintain level flight, the rudder trim also had to be significantly adjusted.

I have put this down to the expansion of the push rod inner with the higher ambient temperature.

I propose to remove the yellow inner rod and replace it with a length of threaded metal rod inside the red sleeve.

Will this remedy the problem?

Daily temperature diference morning to afternoon can be quite significant at times and I expect this will be an ongoing issue.