i actually had checked the twist on the left wing earlier in the week, but here's a picture of how i did it. and yes, i used a bucking bar tied to a fish line for a plumb bob. i laid out the wing walk doubler and cut it to size. i didn't cut it to the width though, i don't see any reason to narrow it down. i'll see how it fits once on the wing. drilled all the holes and cleaned it up, then put it on the wing and got it drilled to size.
