Hobbico Spectrum Assembly Instructions Manual page 14

mark the location of the mounting holes. Drill 3/32"
[2.4mm] mounting holes through the marks. Wick
two to three drops of thin CA into the holes to
harden the underlying balsa, then re-drill the holes.
Attach the horn using two 2mm x 15mm machine
screws and a nylon nut plate. Do not over-tighten
the screws, crushing the underlying balsa.
9. Install the rudder pushrod. Cut the 1-3/4"
[44mm] tubing into 1/4" [6mm] pieces to be used
as clevis retainers. Place a clevis retainer onto a
clevis. Thread the clevis 14 turns onto the pushrod.
Attach the clevis to the outside hole on the control
horn. Slightly bend the pushrod as necessary to
allow for free movement.
10. Center the rudder and rudder servo and
mark the pushrod where it crosses the servo arm.
Enlarge the servo horn hole with a 5/64" [2mm] drill
bit. (The Hobbico Quick Drill set (HCAR0699) works
well for this purpose.)
11. Make a 90-degree bend in the pushrod on
your mark, then insert it through the enlarged hole
in the servo arm. Secure the wire in place with a
nylon pushrod keeper. Trim the excess wire 1/16"
[1.6mm] above the pushrod keeper.
12. Install the elevator control horns by
positioning the horns as close to the inboard edge
of the elevators as possible and mark the location
of the mounting holes. Drill 3/32" [2.4mm] mounting
holes through the marks. Wick two to three drops
of thin CA into the holes to harden the underlying
balsa, then re-drill the holes. Attach the horns
using four 2mm x 15mm machine screws and two
nylon nut plates. Do not over-tighten the screws,
crushing the underlying balsa.
13. Install the elevator pushrod. Place two
clevis retainers onto two clevises. Thread the
clevises 14 turns onto the pushrod. Attach the
clevises to the outer holes of the control horns.
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