Great Planes 25% Pitts M-12S 50cc ARF - GPMA1421 - Manual (Page 19)

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2. Insert a 6-32 x 1/4" [6.4mm] socket head cap screw
into two 3/16" [5mm] wheel collars. Be sure to apply a couple
of drops of thread locker to the screws. Slide a wheel collar
onto the axle followed by the wheel and another wheel collar.
Tighten one wheel collar against the fl at spot on the axle
and then tighten the other wheel collar against the wheel.
Be sure the wheel spins freely. Adjust the wheel collars as
needed to assure the wheel spins freely.
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3. Slide the wheel pant over the wheel and axle.
Attach the wheel pant to the landing gear with two
4-40 x 1/2" [12.7mm] socket head cap screws, #4 lock washer
and #4 fl at washer. If the wheel is not centered in the wheel
pant, adjust the wheel collars to allow the wheel to spin free
without touching the wheel pants.
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4. Repeat these steps for the other wheel and wheel pant.
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5. Locate the nylon bushing and nylon pin. Glue the
bushing into the hole in the back of the fuselage.
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6. Glue the nylon pin into the hole in the rudder. Install the
end of the pin without the hole into the rudder. The hole in
the pin should be in line with the rudder and the pin should
extend from the hole 1/4" [6.4mm].