Break the edge that will be exposed/seen in the finished product. The breaking of the edges is so when riveted the seem stays tight, without the slightest breaking of the edge the top skin will curl up ever so slightly leaving an unsightly edge fit.
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Maule MXT-7(daily flyer)
Lancer 235(partner)
Raidial RV-8R Ephanage Done, Wings Done, Fuselage on it's tall Grove gear & engine hung
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