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Position wing accurately and screw down using washers.
Mark wing with pencil around washers.
Remove wing, cut out holes to diameter of dowel.
Test fit dowels and cut to required length and taper.
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Go fly.
I don't do it this way but was trying to picture the steps anyway... at this point..
Mark wing with pencil around washers.
Remove wing, cut out holes to diameter of dowel.
How is the wing held in place is you have a big hole the diameter of the dowl in it. I know I'm not picutring this properly in my head.