Great Planes HyperFlow Ducted Fan System - GPMG3910/3911 - Manual (Page 5)

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3. Press the 2mm fan rotor adapter onto the motor. Using
threadlocking compound, tighten the set screws against the
motor shaft. Allow a small amount of clearance (1/8" [3mm])
between the base of the adapter and the motor to prevent
binding. A 3/32" [2.4mm] hole can be drilled into the side of
the fan housing 9/16" [14.3mm] from the front edge to insert
an allen wrench for the fan adapter set screws.
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4A. Fit the fan rotor over the brass fan adapter and push
it down so it is fully seated. If you will not be installing the
optional rotor cone, thread a 3 x 8mm Phillips screw with
a 3mm washer through the fan adapter. Be sure to use
threadlocking compound.
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4B. If you are installing the optional rotor cone, press it
onto the fan rotor as shown. Insert a 3 x 8mm Phillips screw
and 3mm washer (with threadlocking compound) into the
hole in the rotor cone and tighten the screw into the brass
fan adapter.
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5. Cut a portion of the aft cone away for motor cooling and
to allow the motor leads to pass through. For most motor
applications, the aft cone should be approximately 1-1/4"
[32mm] long after cutting it.