So I still need to practice a techique to draw a center line on a flange without measuring every little thing. I learned it on the hints for homebuilders videos produced by the EAA. As shown by the double line, I still need to eyeball the center a bit better. The holes that are drilled are pretty much centered along this line though,so it worked out fine. Edge distance is the concern here. Not enough nad the part can weaken and fracture, too much and the edge curls up and will also not be very strong.
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