Riveted a few of the rivets on the aft spar. Then I took off the HS from the jig too see how things were going. As I suspected, what had happened was that even though the HS was straight in the jig, when it came off, it took the former shape. Each single cleco doesn't really force the HS into shape, but all of them together does. The rivets will also force it more into the former shape, because they naturally will center the holes when they are squized. So when in the jig, the HS was in a lot of tension that increased a tiny bit for every rivet that was squized. When taken out, the tension is released, and the HS gets to its former shape.
So much for easy fixing. There is only one way to fix this: New skins.
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