GREAT PLANES Ryan STA EP Instruction Manual page 31

13. Test fit the fin in the fuselage base. You may need to
sand the bottom end of the TE to allow the bottom of the fin
to fit tightly against the base. Align the LE of the fin with the
center mark on the top deck. Use a builders triangle to
check that the fin is perpendicular to the stab. When
satisfied with the fit, use 30-minute epoxy to glue the fin to
the fuselage base, former F9 and F8B. Before the epoxy
cures, recheck that the fin is perpendicular to the stab.
14. Use 6-minute epoxy to glue the two fin fairings to the
side of the fin and the fuselage base.
15. Mark the location of the tailgear wire on the rudder
and the nylon tailgear bearing on the fuselage.
16. Drill a 3/32" hole in the LE of the rudder at the mark
you made for the tailgear wire. Then, cut a groove for the
nylon tailgear bearing. Test fit the tailgear wire in the rudder.
17. Cut a slot in the aft edge of former F9 at the marks
you made for the tailgear bearing. Without using any glue,
join the rudder to the fuse.
18. Glue the two rudder fairings on the bottom of the
rudder, aligned with the fuselage.
19. Remove the rudder from the plane. Trim and sand the
rudder fairings to match the shape of the rudder. Bevel the
fairings to match the angle of the leading edge.
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