Carl Goldberg GPMA1956 Eagle 2 ARF - Manual (Page 14)

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5. Place the control horn on the rudder, as
shown above, and mark the hole locations on the rudder,
just as was done on the elevator. Then drill 3/32" holes
and mount the control horn, screwing through the rudder to
the nut plate.
6. Slide the fin mounting posts into the top of
the fuselage and check the fit. The fin should fit easily into
each slot and should stand upright by itself. Enlarge the
holes, if necessary. When satisfied with the fit, draw lines
on both sides of the fin, showing its location on top of the
fuselage.
7. Remove the fin and carefully trim away the
covering where the fin mounts on the fuselage and stab,
being sure to avoid cutting into the wood structure
underneath.
8. Remount the fin back on the fuselage and
put a 90° triangle against the fin to make sure it is mount-
ed perpendicular to the stab.
9. When satisfied with the fit, mix up a couple
of spoonfuls of epoxy.
10. Remove the fin and apply a thin, even
coat of epoxy on the bottom of the fin and along both sides
of the fin mounting posts. Be careful not to apply too thick
a coat of epoxy, to avoid the glue squeezing out from
underneath the fin.
11. Mount the fin on the fuselage and place
the 90° triangle against the fin. Use masking tape to hold
the triangle in place until the epoxy dries. Make sure to
not glue the triangle!