I have an OTOP which has the same aileron set up as the Impact and I didn't like the servo
arrangement either. For one thing it's a pain in the a** to mount and work on the servos and
using the supplied control arms you don't use all the resolution of the servo. With the long arms
you have to dial it down so much it kind of defeats the purpose of using a premium digital servo.
I decided to just surface mount the aileron servos and use standard Hanger 9 aluminum servo arms
as I have used on all my other airplanes. It sure is a lot easier to get to the servos and make any
adjustments and it only takes a few minutes to modify the mounting.

tommy s