Tool for checking rib flange straightness

While preparing to drill the bottom wing skin to the ribs, I wanted to be sure that the center line of the ribs were straight.

When doing top wing skin I had used a metal strip with holes drilled in a straightline to be able to verify straightness.

The improved version uses a 1/8" acrylic strip about 2 inches wide with a line drawn to verify the center line of the rib flange  is straight.

In addtion, two red lines were added that would give me a warning if a drilled hole might get too close to the edge of the flange.

Video provides a few more details.

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