I installed a new servo arm retaining screw specified by a TruTrak service bulleting and installed the pitch servo. I moved the bellcrank up to the same position occupied by the cable bellcrank so that additional mechanical advantage could be obtained. Apparently, some folks have found that the lower bellcrank mount specified in the TruTrak drawings doesn't have enough leverage. This required adjusting the length of the bellcrank, in this case shorter than previously. The two limiting factors on length are to avoid the dreaded over-center condition where the stick would become locked full forward. With the stick in the aft position, it is possible to bind up the lever arm, causing it to also get stuck in that position. Fortunately, I was able to avoid either pitfall.
Autopilot pitch servo with larger lever arm bellcrank installed.
