Resuming work on the left frap meant finishing work on the trailing edge extrusion (VA-140) to prepare it eventually be riveted in. But first, I had to cut the two extrusions to the final sizes, and then counter-sink the holes on both sides to accommodate the dimpled skins, before actually dimpling those two skins of the flap. Then I started flush riveting the last side of the nose skin of the flap. This step is critical since it finalizes any twist that may be present in the frap. I used a digital level to compare the angles on the two hinge brackets and applied some corrective twist whenever I felt necessary during this riveting. Bucking these rivets also required either using the extremely long special bucking bar, or sticking my hand down inside of the skin to hold the bucking bar (I actually found the latter easier). After that long seam of flush rivets was completed, I finished the rest of the nose rivets using blind rivets. I then had to set the flap down on a very flat surface so that when the trailing edge extrusions are glued in with VHB adhesive tape, it'll cure without any unintentional twist. I clecoed things down and used some heavy weights to let this all cure overnight. What's next? After curing is done, I can finish riveting the trailing edge.