If it is a DFC head, the DFC arms connect to the balls on that are on the extensions on that swashpate, not the ones that are directly on the sides.

Your servo arms should be as close to 90 degrees as possible when the diagnostic screen says 0 degrees for pitch, or when you click the "subtrim (tuning)" box in the servo screen of the software, which moves the servos to center/0 degrees automatically.

Your servo to swashplate linkages should be the length that the manual for your helicopter says they should be. As for the length of the servo arms, use the hole that the manual to your helicopter tells you to use.

Then using a swashplate leveler, trim the servos in the spirit software until the swashplate is perfectly level.

Then attach the rotorhead, connect the DFC linkages to the swashplate. If the blades are not 0 degrees, turn the plastic ball links on the DFC linkages out until the blades are 0 degrees.

If you have to turn the ball links out too much (not enough threads in the plastic links) then you should make your servo to swashplate linkages longer instead.

Once you have attained 0 degrees of pitch on the blades, matching 0 degrees in the spirit sotware, check the pitch amount at full positive and full negative pitch to see if they match. Often they do not.

If they do not, hit "servo travel correction" under the servo tab in the spirit software, and move all three sliders down or up in equal amounts, for whichever (positive or negative) to make full positive and negative collective equal.

Proceed to the 'limits' tab and set the amount of pitch you want to have, and then set the cyclic ring. Set this as high as you can without mechanical binding. Make sure you check cyclic ring with full positive collective, and full negative collective, to make sure nothing mechanical is binding in those positions, not only at 0 degrees.

Then, for setting of the 6 degrees geometry in the advanced tab, make sure your transmitter stick is at 0 degrees pitch first.

Please post photos of the setup if you are having any more problems, it would be easier to help if I could see.

Hello,

recalibrating TX is never needed, because it is done automatically each power up.

After changing swashplate you should re-do:
1) Subtrims
2) change 3 bottom push rod length to level the swashplate
3) change 2 upper push rod length (if adjustable) to reach 0°.
If two upper push rods are not adjustable such as with some DFC heads, you have to adjust 3 bottom push rods - equally make them longer or shorter, depending on what resulting angle of the blade is.
But still, in any case, Subtrim (Tuning) must give you perfectly perpendicular servo arms, levelled swashplate and 0° between main blades. If not, then also other steps will be likely wrong.
4) Once previous steps are done you can set Geometry 6° again.