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Horton Stol Wing Kit and Aviation Enterprises Lightning Winglets. Is that considered a stacked mod? Guess so. When installing the winglets I first tried to use a sheet metal screw between the original screws but did not like the results. I installed rivnuts on all fasteners and it just is much better mounting process.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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