Assembling the trim tab went pretty smoothly, it was a bit of putting it together and seeing how to sequence the riveting so that it came out correctly and I was able to as many regular rivets as possible. I assume doing it this way, using the riblets, is a whole lot easier and less of a headache than trying to bend the tabs up and down in a slippery jig. I am happy with this and would not think about doing it again. The trim control horn had rivets that would go through the riblet as well so I to account for that. For the rivets I could not do with traditional rivets I used MK319-BS pops. I was able to get the squeezer equipped with the longeron yoke around the trim tab spar in order to rivet it to the bottom of the skin. I also affixed the tab to the elevator with the hinge as a test fit.