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Remove the nose wheel.
Remove the main landing gear as well.
Get the tail dragger landing gear out
The main landing gear fits into the receiving slot on
the fuselage. just in front of the wing's leading edge.
You will have to pinch the piece a bit to slide it in
securely , Then screw the two tabs down over the
receiving slot as shown in the photo.
Slide the tail wheel wire into the plastic
mount as shown in the photo. Then this unit
attaches to the fuselage using two screws.