Carl Goldberg GBGA1043 - Manual (Page 19)

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4. Remove the cowl and mount the muffler on the
engine. Use another piece of paper and cut to
fit around the muffler. Mark the location of the
paper on the fuselage so you can relocate it
after the cowl is reinstall..
5. Reinstall the cowl and fit the paper in place on
the fuselage and mark the location of the hole
for the muffler. Repeat for the other holes in
the cowl.
6. When mounting the cowl for flight, use locktite
on all the bolts.