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Time to drill the first holes for the Roll Bar
The drawing explains the exact placement of these holes into the F-721B Canopy Deck. It's a little confusing, but I managed to figure it out. The Aft #40 hole goes through the top of the F-721B flange, but also has to go through the second F-721B flange below. These holes are used to guide the drilling of the C-668 spacers and the Roll Bar (WD-641).
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