Hangar 9 B25J Mitchell ARF Assembly Manual page 37

Section 6: Glow Engine Installation
Step 24
We used a fuel dot on the line to the needle valve that will
mount to the cowling, making fueling the engine much
easier when the cowl has been installed. When using a
tank and the carburetor as shown.
Step 25
Connect the lines from the tank to the engine.
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Step 26
Use hobby scissors and a rotary tool with a small sanding
drum to make a round opening in the dummy engine for
the motor shaft.
Step 27
Use a sharp hobby knife to remove the material
between the dummy cylinder heads to allow cooling
air to pass through the dummy engine and over the
motor. Use 30-minute epoxy to glue the dummy engine
inside the cowling.
Note: Do not remove the area between all
of the dummy cylinder heads. You need to
only remove the area in front of and next
to the glow engine. This will help maintain
airflow over the engine cylinder head and
help to promote proper engine cooling.