Great Planes Extra 300SP EP ARF - GPMA1188 - Manual (Page 12)

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3. Apply thread locker to the 4- 40 set screw and then
install it into the 3/32" [2 mm] wheel collar. Slide the wheel
collar onto the tail wire. Then, insert the tail wire into the nylon
bushing and nylon stud you glued into the fuselage and rudder.
Place the tail gear bracket in place as shown with the tail gear
bracket aligned with the bottom of the fuse. Mark and drill a
1/16" [1.6 mm] pilot hole at both tail gear bracket mounting
hole locations. Secure the tail gear bracket to the fuse with
two # 2  1/2" [13 mm] sheet metal screws.
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4. Install the tail wheel on the tail gear wire and press the
nylon retainer on the tail gear wire to secure the tail wheel.
If necessary, add a small drop of CA glue to lock it tightly to
the wire.
Install the Motor
The Extra 300SP EP has been designed to use the Great
Planes RimFire .32 (42-50 - 800) Outrunner Brushless motor.
If you will be installing a different motor, you may need to
modify the plywood motor box. We recommend that this be
done at this time.
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1. Install the RimFire motor using four 4-40  ½" [13 mm]
SHC screws, four #4 lock washers and four #4 fl at washers.
Before installing, apply a drop of threadlocker to the threads
of the SHC screws.