33 of 44: Nov 2011
The distance between the tubes has to be 26.25 inches. But what is more important is that the tubes align perfectly with the mount points on the pitch torque tube. Even a small deviation could make the push tubes to interfere with the rivet tails on the aileron tube. After the first bearing was mounted, the pitch torque tube was held against the aileron tubes with a bungee to reference the drill holes for the second bearing. The mounting tabs on the torque tube are tapered, which when inserted into the aileron tube will center itself.