2. Upper wing

a. On this surface you have to ensure that you install the center rib mount. The rest is like above.
b. Since there is no dowel to clamp to I used masking tape.
c. If you use gorilla glue make sure you pull the tape and clean under it or replace it. Otherwise you'll end up with a mess under the tape.

To clean the excess glue after it spreads out use Acetone.