Hi,

I believe that the rods in the SIG SE KIT are the same ones that are used on the SIG Kadet LT40 kit. They looked the same to me, so when building my SE I changed them out for some sullivan rods. Like BasinBum stated I to have seen a noticable difference just between first thing in the morning to about noon time with the nyrod tubes on my Kadet. Mine changed so severly that I had to make a physical adjustment to the threaded clevis' since the trim tabs on the radio could not even correct the shift fully.
If your building the kit version, it is easy enough and not too expensive to just replace them with either all metal rods, or even sullivan rods which do not seem to move with temperature changes. My SE is flying great with the Sullivan 505's I believe (Blue outer tube, with Yellow inner tube). Just make sure you don't leave more than the 1" of inner tube outside the outer tube as explained in the instructions. It was either my SE or my Skybolt I had a longer span from where the blue outer tube exited the plane and where the control horns were located, so I used a longer piece of threaded rod inserted in the yellow tube to give the rod more support. It's working fine.