Well, let me see. the servo control arm only goes in one place. Top or bottom, I guess it you put the servo on a table with the servo shaft on the top, then that's the top of the servo.

There is only one servo shaft and that's where the servo arm goes.

The servo goes in the wing servo tray so that the servo arm, disk, whatever you wish to use, is on the outside of the wing. When put in the plane, of course, the wing is right-side up (on top of the plane) but the servo is on the bottom of the wing, but the arm/disk, whatever you use, is under the wing and will then be inside the plane, and will be upside down.. if you get my meaning.

That's the only way I can figure out what you mean and hope that helps.

If you need any more help, just reply and me or someone else will be sure to answer you.

CGr.