4.5 hours
Continuing on the aft spar tunnel web, I got all the new holes updrilled and dimpled/countersunk. It'll be a lot of flush rivets!
Next I had to go back and countersink the holes on the aft side panel vertical, where this thing will attach to. Since the verticals are already riveted to the side panels, I had to use my hand drill instead of the drill press. I could still use the microstop to do the inboard holes, but the outboard holes were too close to the wall. I used this extension that came with my hand deburr tool and it worked perfectly. I forgot I even had that extension until I saw Ryan Roth's blog entry where he did the exact same thing!
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