Hangar 9 SU-26MM Sukhoi Assembly Manual page 23

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3. Mark where the cowl mounting ring and gussets touch
the engine box and remove the covering before applying
epoxy. The picture below shows where the gusset attaches
to the cowl mounting ring and engine box.

4. Mix 30-minute epoxy and apply glue to the gussets
and cowl mount ring, also rub some epoxy in the slots
where the gusset tabs interlock, then glue the mounts in
place. Attach bottom cowl and wait until epoxy is set before
removing the cowl. This ensures the cowl mount ring and
gussets are glued and aligned properly. Clean excess epoxy
with alcohol swabs.
Hangar 9 3.1m Sukhoi SU-26MM ARF Assembly Manual

5. Mount the lower half cowl.

6. Mount the upper half cowl. At the mid-point that both
lower and upper half meet, use colored washers and 1/4 inch
4-40 screws.
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