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Spar attach bracket question - drilling of 2nd hole

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Jerry

Radial Skybolt Builder: 220.45% completed
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The plans showed the location of the hole for only one of the flanges on the brackets. My question: Should I drill the other one now and then match-drill the spars the set of holes, or slide the spar into the bracket, square up the drill bit to it and going through the existing hole… drill the spar and then into the metal flange?

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