Great Planes 25% Pitts M-12S 50cc ARF - GPMA1421 - Manual (Page 7)

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2. Install a 1" [25.4mm] servo arm onto your
servo. It’s recommended that you use an aluminum servo arm.
Many different brands are available but we used the Great
Planes 1" [25.4mm] aluminum servo arm (GPMM1100).
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3. Install a 12" [305mm] servo extension onto
the servo lead. Secure the extension to the lead with tape,
a piece of shrink tube or some other method to keep them
from coming unplugged.
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4. Place the servo onto the servo mounting
blocks. Drill through the servo mounting holes with a 1/16"
[1.6mm] drill bit. Install the servo onto the servo cover using
the hardware included with your servo. Center the servo and
then install a servo arm as shown.
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5. Inside the servo bay a string is taped. Tie the
string to the servo extension. Pull the string and the servo
lead through the wing. Untie the string from the lead and
insert the lead through the small hole on the top of the wing
at the root. Tape the lead to the wing to prevent it from falling
back into the wing.
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6. Place the servo cover onto the wing. The
opening for the servo arm should be pointed towards the
wingtip. Mount the servo cover with #2 x 3/8" [9.5mm] washer
head screws.