Top Flite TOPA0905 - Manual (Page 21)

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15. Measure from the bottom of the landing gear
2" [51mm]. Make a cross centered in the landing gear.
On the intersection of the two lines, use a punch to
make a punch mark for the drill bit to start in.
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16. Drill a 3/32" or #43 [2.4mm] hole on the
mark. Important! When you drill the hole, be sure the
drill is perpendicular to the surface of the fuselage. Do
not drill the hole perpendicular to the side of the
landing gear.
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17. Tap the hole you just drilled with a 4-40 tap.
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18. Using a file or
grinder, taper the end of the
4-40 x 6" [152mm] threaded
rod to a point. Cut the
threaded portion to a length
of 3/8" [10mm].
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19. Screw the pointed threaded rod into the
hole you tapped in the landing gear with the pointed
end pointing out of the gear. The point needs to be
just above the landing gear.
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20. Carefully position the door over the opening
in the fuselage. When you are satisfied with the
position, press the door firmly onto the point of the rod.
Press hard enough to leave a mark inside of the door.
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21. Locate a 4-40 x 1/2" [13mm] socket head
cap screw. Cut it so the threaded portion of the screw
is 3/8" [10mm] long.
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22. Remove the pointed rod from the landing
gear. Drill a 1/8" [3mm] hole through the mark you
made in the door. Position the door so the hole in the
door and the hole in the landing gear are aligned.
Attach the door to the landing gear with the 4-40
screw you cut and a #4 flat washer.
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23. Cut a small nylon control horn as shown.
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24. Apply a drop of medium CA to the control
horn and glue it to the square molded in the door.
(You do not need to use too much glue as the glue is
only being used as a temporary mounting procedure.
Once you are assured everything is working properly
the control horn will be permanently mounted).
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