I have just completed my Trex 700e and I am not sure as to the corrrect procedure for setting up and installing the round servo horns. I have built a 550, 450 and a 250 Trex but have never used round servo horns. I am in need of some instruction in this area. Thanks

They're just like any other servo wheel/ horn, except they're round. Make your own holes in them.
you want one of these and life will be easy.

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if it is like the 600 ESP, it take a little bit but you have to get the links the same length. Then you have to find the right position on the spline for the alignment.

i set mine up FBL with a BeastX. The stock plastic horns wouldn't quite dial in perfect. i upgraded to the aluminum one and they did give the right alignment. i also had an issue with the nut spinning in the plastic horn.

My crashes are cooler than your flying! ;^)

Make sure both arms are equal or you will be loading the servo.

forgot to mention, you servos need to be on with your Tx set to zero on all trim and sub trims. this will also let you know if your 'loading' the servos. they will buzz if the push rods are too long/short.

My crashes are cooler than your flying! ;^)