GREAT PLANES RV-4 Instruction Manual page 27

37. From former F5B measure forward 1/2" [13mm] and
make a mark on each side of the fuselage. With 6-minute
epoxy glue the wing mounting plate to the fuselage sides,
over the wing saddle doubler at the the mark you made.
38. Locate the die-cut 1/8" [3mm] plywood wing mounting
plate doubler (WMD). Glue the wing mounting plate doubler
to the wing mounting plate with 6-minute epoxy.
39. Locate two die-cut 1/8" [3mm] balsa stab braces
(SB). Glue them together to form the stab brace.
40. Turn the fuselage over and glue the stab brace in
place on top of the fuselage at the aft of the fuselage.
41. Sand the fuselage sides flush with the stab brace.
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