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Marv:
Reference perpendicular bolt holes.
The cheapie way to do this  is to drill a hole of the size you want in a 2x4 block on a drill press to get it straight then clamp the block on the subject to t be drilled with the hole in the block located where you want it and drill through the hole. Hank - 235/290 Working on flaps/ailerons - San Mateo, CA.

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