To assemble the camera damping system on the upper frame.
Use M2.5 *6 round hexagon screw
in the front but do not tighten.
Then, use the M2.5 *6 hexagon
screw with cup washer screw in
the adjustable track, now you can
tighten the front screw when it is
in the position as required.
Mount the transmitter board
between both sides of the upper
frame.
Use M3 *6 set screw to lock the
landing gear on the undercarriage.