I used Sullivan Carbon Rods, a pair of them, side by side to a common connection at the servo in the servo tray. They fit in the existing tubes supplied in the fuselage. On the rear end, I allowed the carbon rods to extend out the holes for about two inches or so. For the steel rods that go in the carbon rods, I took the rods, held them with pliers, chucked the steel rods in a variable speed drill, put a few drops of CA on the steel rods, then pushed them in the center hole of the carbon rods while the drill was turing at medium speed. I pre-measured the length of the rod to go into the carbon rods and marked the steel rods so I knew how far to push this in. You have to work fast because the CA will sieze up pretty quickly, but initially, it acts as a lubricant so push them in quickly to the pre-measured line then stop. They will be fine.

When making the measurement for the steel rods, make sure that you measure far enough so that the combination of the carbon rods and the steel rods go in the fuselage far enough so that the carbon rods do not flex outside the fuselage.

I've flown this setup now for a couple of years and it's solid, reliable, and very light.

CGr.