GREAT PLANES RV-4 Instruction Manual page 26

31. Drill a 5/32" [4mm] through each of the punch marks
on the firewall.
32. Remove the fuselage from the plan and turn it over.
Test fit the firewall to the fuselage. The firewall needs to be
90 degrees to the fuselage top. If it is not, sand the fuselage
to adjust until the firewall is 90 degrees to the fuselage top.
When you are satisfied with the fit, apply a small drop of
medium CA to the flange of each of the 6-32 blind nuts,
being careful not to get any of the glue into the threads.
Then insert the 6-32 blind nuts into the holes you have
drilled on the backside of the firewall.
33. Using 30-minute epoxy, glue the firewall in place to the
fuselage sides, the fuselage top and the bottom firewall
(BF). Use a small builders square and check again to be
sure that the firewall is 90 degrees to the fuselage top once
the firewall is glued into place.
34. Cut off the fuselage side that extends beyond the
firewall and sand the sides flush with the firewall.
35. Glue the 1/8" [3mm] die-cut plywood F5B to F5 as
shown on the plan.
36. Locate the two die-cut 1/8" [3mm] plywood wing
mounting plates (WMP). Glue them together to form one
1/4" [6mm] plate.
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