One of the royal pains in dialing in the controls is getting the control shaft bearing to work correctly on the control shaft. The issue is that the kit has you drill a 3/16" hole through the bearing and then run a bolt through that and torque it. When you torque it, the bearing has a propensity to deform and that in turn screws up the smoothness of the controls. One guy on the Kitfox forum had a suggestion and I really like it so that's what I did. It involves installing a metal tube into the bearing on both sides with the tube sized to the bearing height (I did mine to 0.002" of the bearing height), drilling out the ID of the tube to accept the bolt and then torque down the bolt when installing. While I haven't installed it into the fuselage yet, I did fit the first side per the instructions and built the second tube so that when I do install the bearing, it will be all set. Yeah I know - doesn't seem like much but it was a good day to build an experimental aircraft where you can do stuff like this.