Before match-drilling the left wing skins, I decided to double-check the spar for any twist. I had previously used the SmartLevel to adjust both ends, but I decided to double-check them using Vans’ recommended method – measuring the distance from plumb-bob lines hung from clecos on the spar, to the top edge of the rear spar. The picture below shows the setup.

Checking the wing for twist

Turns out that I didn’t need to be concerned….the measured distances were within 1/32″ of each other. I guess I can live with that.