fits a standard 9g servo.
1) put servo in neutral position and add servo horn
2) place servo in the frame, optionally fix it in the frame with 2 small wood screws
3) put frame into a prepared pocket in the wing. I usually secure it with only double sided tape but you can also glue it in

This frame does not allow easy removal of the servo without pulling the frame out of the wing. Totally symmetric so you can print the same part for the right and left wing.