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Remove the rubber band.
After pulling the belt thru the
boom with a long wire with
bended end put on the tailrotor
housing that the screws of the
brackets fi t fully in the slots of
the boom. Lokk in the housing
that the brackets are vertical. If
not yet then open the screws a
bit more.
Insert the tail pulley into the
belt from the side that has no
washer yet and put it into the
tail housing.