Great Planes Waco YMF-5D Biplane ARF - GPMA1295 - Manual (Page 29)

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7. Remove the muffler. Fit the cowl centering tool to the
engine as shown. Use four metric M4 x 20mm screws (not
supplied) to hold the tool up against the drive washer of
the engine. Note: The cowl will not sit flat against the cowl
centering tool flange because of the right thrust in the engine,
but you should push the cowl back until it is firmly seated on
the flange of the tool.
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8. Use a cutoff wheel on a Dremel ® rotary tool and work
on trimming the cowl away for the cylinder head. Be careful
to align the cowl so that a pair of blisters points directly up.
Placing a piece of masking tape on the cowl and the fuselage
with an index mark on them will be helpful. Trim away material
until the cowl is resting on the flange of the cowl center tool
and there is sufficient clearance for the head. Then, lay the
template over the top of the cowl and transfer the outline of
the head and muffler cutout to the cowl. Warning: Wear a
dust mask when cutting fiberglass parts. Cover up the spark
plug hole with tape.
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9. Remove the cowl and finish cutting access for the head
and the muffler. Switch to a sanding drum to smooth the
edges and radius the corners. Fit the muffler to the engine
and test fit the cowl. Clean up any pen marks on the cowl
with alcohol when you’re finished.
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10. Install four blind nuts on the front side of the cowl
mounting ring. Pay special attention to the orientation of the
cowl ring so that you install the blind nuts on the correct side
of the ring.
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11. Cut a 16" x 16" [406mm x 406mm] piece of Great Planes
Plan Protector film (GPMR6167) or some MonoKote backing
film or plastic food wrap. Make a hole in the center of the film
by making an “X” consisting of two 6" [152mm] slits. Sand the
inside of the cowl where the mounting ring fits, using 150 grit
sandpaper. Clean it with alcohol.