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So what do I do then to find this arc? I am thinking take a long board place in on the highspot on the cab, using a protractor, get the board to slope down 8 degrees. Measure the distance from the bottom of the board to tailgate. Then use PVC to make the gentle curve and take measurements at intervals?
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Referring to
Permalink #16, that's what I did. Although I started well forward of the crown. The wood strip laid flat on the roof from the windshield header to the crown.
The PVC would be redundant, if you use knot-free wood. I would think it easier to take measurements off the rectangular section. But then I'm actively dislike PVC.