Estes Odyssey #7235 Build, Part 23, Gluing The Rudder Fin

The top Rudder fin wasn't making contact with the inside tube. A close look showed me the BT-80 tube was a little out of round.

Wrapping a rubber band over the top of the rudder pressed things down and brought the root edge onto the inside tube.

Visually check the alignment before the glue sets up.

After the root edge glue dried, I added some slight root edge fillets applied and smoothed with a Q-tip.

Before the root edge of the wing fins were glued in, 

The inside surfaces between the tubes were roughed up using the sides of a round diamond file. This was just enough to rough up and remove some gloss white paint that got into the tight tube joint.