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The doubler is positioned on the inboard channel:
Steve drills and clecos the channel doubler:
Caleb and Roger drilling out the top main spar:
As we have been installing this "Upgrade Package" we have been verifying the drawings, and making sure that all Upgrade Package parts fit properly, and that there is access to install them. We've had to make a few updates in the process...
Match -drilling the rear spar bolt hole: