I am putting together a 60 size U-CAN-DO and have what is probably a dumb question. I am installing the aileron servos. The instuctions say to tie the string to the servo wire and then pull the center of the string out of the servo hole and then pull the wire through the wing. Question: Is there supossed to be a hole in the center of the wing to pull the wires through? Mine does not. Where does it go?

Thanks