Seagull Models ZERO MS:123 Assembly Manual page 5

3x35mm.
2) Position the control horn on the bottom of
the aileron. You will see pre-drill hole 3mm for
the horn mounting screw on the aileron.
3mm.
3) Place epoxy into hole. This will harden the
threads and prevent the crews from pulling
loose.
4) Thread a control horn end with aluminum
washer, lock nut until the top edge of the end is
9mm from the vase of the horn as shown.
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2 sets.
method as same as the aileron control horns.
Aileron control horn.
INSTALL FLAP CONTROL HORN.
Install the flap control horn using the same
3x35mm.
2 sets.
5