Good morning!
There are other posts about this subjetc. Chanel 5 is an on/off one, so it isn't usefull, and there is the slave channel trim problem. I found one way, and this was my reply.


I found one way on my Eclipse 7:
My plane set up is as follows.-
Two halves elevator, with independent servos. These are at diferent vertical distance (not enough room), but the link points are at the same,and a perfect simetric configuration. And I use flaperons option. One more thing: I fly on Mode I (don't worry).
1º Mix 1- channel 2 with 7 at 100% both ways
2º Set exact same halves height with channel 2 trim or subtrims.
3º Correct differents throws with EPA
4º Mix 2- channel 7 to channel 2 at 100% both ways

Now you can use channel 7 pot as elevator trim. There is a minor problem, as it would be too much potent in flight. To solve this, and if you have another free channel (if you do not use flaperons), f.e. channel 6, set another mix 3- channel 6 to 7, and a little percentage in both ways, as your convenience.

I tested the first way, and its easy as I manage elevator with left hand, and 7 pot is in the right. If you fly Mode II, and without flaperons, set the mix as properly as you use rigth hand on elevator and the left on the the channel 6 pot. (changing 7 by 6 on the upper instruccions, and viceversa)