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Phenolic Spar Attach Inserts

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Joined
Aug 8, 2021
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For the Spar attach fittings, are the phenolic inserts the best thing to do? It says in the Skybolt manual to make .625 phenolic inserts for where the spar attaches to the fuselage. I tried searching for this on the forum but couldn’t find much. What makes phenolic better then just the wood?
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