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Countersunk the F-904A Bulkhead for the F-904M stiffeners
To prevent the countersink bit from scooting around and messing up the hole in the bulkhead, I clecoed on the F-904M stiffeners from behind with #19 clecos. This forces the countersink bit to stay centered while it spins inside the holes in the F-904M stiffeners.
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