At SETUP MENU point H we trim the servo center positions so that each servo horn forms an exact 90 degrees angle with the adjustment linkage. This is necessary as usually you will not be able to attach the servo horns in exact center position to the servo. After all servos have been trimmed do not proceed to the next menu point yet. After trimming adjust the linkage rods according to your helicopter's manual, so the rotorhead system is set up neutral and allows to have equal movements in all directions. For this the swashplate should be at the midpoint and perpendicular to the main shaft and the rotor blades should have 0 degrees of pitch. Always work this out from bottom (servos) to top (blade grips).
In case your helicopter has a non-DFC rotor head with adjustable swashplate driver also don‘t forget to level and phase the swashplate driver in the correct way. At 0 degrees of pitch the swash driver arms must be horizontal and the linkage balls of the blade grips must be perpendicular to the spindle shaft.
