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Wing Butt Fitting Bushings

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JLCUB

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Does anyone have any tips or tricks on how to remove and install wing butt fitting bushings? The forward fitting can be done off wing but the aft fitting has to be done on wing. I know to heat the aluminum and freeze the bushing however my spars are primed so i need to be careful with heat.

Has anyone made or purchased a tool they could share pictures of?

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