Great Planes 27% Extra 330S ARF - GPMA1413 - Manual (Page 30)

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11. Use coarse sandpaper to roughen the inside of the
cowl around each screw hole. Use medium CA or epoxy to
glue the 1/32" [1mm] plywood screw hole reinforcements
inside the cowl centered on each hole.
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12. Mount the cowl to the fuselage with six #4 x 1/2" [13mm]
screws and #4 nylon washers. If using the O.S. 1.60 FX or
RimFire electric motor, place the spinner backplate on the
engine, then mount the propeller and spinner using the O.S.
propeller washer and prop nut that came with the engine and
the spinner adapter nut and spinner bolt that came with this
kit. (If using the RimFire motor, the propeller washer and prop
nut that comes with the O.S. 1.60 FX locknut set (OSMG6688)
will have to be purchased separately.) If using the Fuji-Imvac
BT-43EI-2 engine, mount the spinner and propeller using the
brass adapter collar ring that came with the spinner and the
Fuji-Imvac special propeller bolt (FJIG8050, not included).
Note: The large, aluminum propeller washer that came with
the Fuji-Imvac engine will have to be drilled out with a size
“X” or 13/32" [10mm] drill. For either engine, the propeller will
have to be reamed out as well.
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13. If you haven’t yet done so, cut the air inlet hole in
the front of the cowl below the spinner. Cut any other holes
necessary for the needle valve (on glow engines), mixture
screws and choke (on gas engines), exhaust, etc. The best
way to neatly cut holes in fi berglass is to use a rotary tool with
a carbide cutter. Smooth the edges of each hole with medium-
grit sandpaper. A choke for the Fuji-Imvac BT-43EI-2 engine
can also be fashioned using the included plywood mount and
pushrod hardware shown (the nylon ball link was re-threaded
with a 4-40 tap).