GREAT PLANES Gee Bee Instruction Manual page 19

Glue the tabs to the firewall with 5-minute epoxy. Align the line
on each tab with the edge of the firewall. After the glue has
cured drill two 1/16" [1.6mm] holes in each tab and through
the firewall. Screw a #2 x 1/2" [#2 x 13mm] sheet metal screw
into each of the holes drilled in the tabs. Note: When installing
the screws, be sure to tighten the outermost screws until they
compress into the wood so they are flush with the surface of
the tab. This is necessary so when you mount the cowl ring to
the tabs the ring sits flat on the mounting tabs.
6. Glue the two cowl rings together forming one 1/4"
[6mm] thick cowl ring.
7. Use small clamps to hold the cowl ring in position on
the tabs. Adjust the ring until the distance from the outer
edge of the fuselage to the inside edge of the cowl ring is the
same all the way around the cowl ring. Number each finger
of the cowl ring and number the corresponding mounting
tab. You will find this helpful later when matching the cowl
ring and the tabs when installing the cowl.
8. With the cowl ring still being held in place with the
clamps, on one tab measure 1/2" [13mm] from the outer edge
of the cowl ring towards the fuselage. Make this mark in the
center of the tab. On the mark, drill through the ring and the
mounting tab with a 1/16" [1.6mm] drill bit. Remove the clamp
and screw a #2 x 1/2" sheet metal screw through the cowl ring
and into the mounting tab. Repeat this for all four tabs.
9. Remove one of the screws from one tab. Drill a 1/8"
[3mm] hole through the hole the screw was in on both the
cowl ring and the tab. Now drill a 5/32" [4mm] hole through
the cowl ring and the tab ( drilling through the holes with a
progressively larger bit prevents the plywood from splitting ).
Insert a 6-32 blind nut into the cowl ring. Use a small amount
of epoxy to glue the blind nut to the cowl ring.
10. Install a 6-32 x 1/2" [6-32 x 13mm] socket head cap
screw and a #6 washer through the back side of the
mounting tab and into the blind nut in the cowl ring. Tighten
the screw to the blind nut.
11. Remove a screw from another tab and repeat the same
procedure of installing a bolt, washer and blind nut. Do this to
all four mounting tabs, mounting the ring to the fuselage.
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