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When the assembly is complete, it should look like it
does in the photo.
Turn the fuselage over and remove the detachable
lower piece that holds the tricycle main gear to the
fuselage.
Remove the main landing gear from this piece as well.
See the photo.
The low wing center section will be installed into the
slot where the detachable lower piece used to be.
Using the same four screws that held the
detachable lower fuselage piece in place, anchor
the lower center section to the fuselage.
Reassemble the main tricycle landing gear to the slot
on the lower center section and anchor it down using
the same hardware and screws that held it to the
removable power fuselage piece.