Horizon Hobby HANGAR 9 OV-10 Bronco 30cc Manuel D'utilisation page 18

93. Slide an M4 lock washer on each of the four M4 x 25 button
head screws.
 When installing the retract in the nacelle, the strut
for the retract will face toward the fuselage.
94. Secure the retract in the nacelle using the four M4 x 25
button head screws prepared in the previous step.
 The retracts can be operated manually using the test button
on the retract box. We advise using the retract module to
test the retraction and extension of the retract with the leg
and wheel attached before tightening any of the hardware.
 Tighten the screws evenly. Tightening one at a time fully may
distort the retract frame slightly and cause operational issues.
95. Four M4 lock nuts are used inside the fuselage to complete
the retract installation. Tighten the hardware using a 2.5mm
hex wrench and 7mm nut driver.
96. Route the lead for the servo through the hole in the retract
bay.
EN
97. Inside the nacelle, secure the retract lead so it won't interfere
with the operation of the retract.
 Repeat this section to install the remaining main retract.
18