Great Planes Extra 300S 1.20 ARF Patty Wagstaff - GPMA1305 - Manual (Page 10)

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13. Cut up a servo arm and center it so that the servo
arm is 90 degrees to the pushrod. Center the aileron and
mark on the pushrod where it meets with the servo arm’s
hole. Make another mark 3/4" [19mm] closer to the threaded
metal clevis. Cut the wire at the second mark.
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14. Solder an unthreaded metal clevis on the pushrod
as shown. Install a 4-40 hex nut on the threaded end of the
pushrod. Slip a silicone retainer onto the clevis and install
the clevis on the servo arm. Install the servo arm on the servo.
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15. Find the pre-painted ABS aileron servo cover.
Locate it over the aileron servo and mark the mounting
holes on the wing sheeting. Remove the cover and drill
1/16" [1.6mm] holes through the wing sheeting at the marks.
Wick thin CA into the holes and install the aileron servo
covers in place with two #2 x 1/4" [6.4mm] screws and two #2
washers. Install the aileron pushrod in place. Secure the
servo arm in place with the servo screw. Adjust the length of
the pushrod and tighten the hex nut against the threaded clevis.
HOW TO SOLDER
A. Use denatured alcohol or other solvent to remove
residual oil from the pushrod.
B. Use coarse sandpaper to thoroughly roughen the end
of the pushrod where it is to be soldered.
C. Apply a few drops of soldering flux to the end of the
pushrod, then use a soldering iron or a torch to heat the
end of the pushrod. Coat the end of the pushrod with
silver solder (GPMR8070) by touching the solder to the
pushrod. The heat of the pushrod should melt the
solder–not the flame of the torch or soldering iron–thus
allowing the solder to flow. Note: Do not use silver solder
for electrical soldering.
D. Join the clevis to the pushrod. Add another drop of flux,
then heat and add solder. The same as before, the heat
of the parts being soldered should melt the solder thus
allowing it to flow. Allow the joint to cool without
disturbing. Avoid excess blobs, but make certain the joint
is thoroughly soldered. The solder should be shiny, not
rough. If necessary, heat the joint again and allow to cool
slowly without disturbing.
E. After the joint has solidified but while it is still hot,
carefully use a cloth to wipe away soldering flux.
Important: After the joint cools, coat with oil to protect it
from corrosion. When finished, the solder joint should
appear shiny not dull. If it is dull when it cools, it is a cold
joint and not very strong. Simply reheat the cold joint to
correct this problem.
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