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Spar Shrink cracks?

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Jul 9, 2022
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Fond du Lac, Wisconsin
Got the center section uncovered, and have found some crack like things at the butt ends of the aft spar. Also in the same place on one wing spar. Thinking perhaps wood shrink? Fairly lined up with a bolt hole for the attach angles. Wondering if anyone has dealt with this, and if so how?



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