This work session involved preparing 3 of the doubler plates that go on the left wing rear spar. These doublers all had to be clamped into place and then match drilled and deburred for the dozen or so holes that go through them.
One of the doublers also had a large teardrop shaped hole that a pushrod will go through, so I had to drill a series of holes around its perimeter and then use a bit of dremel and hand filing to smooth that out to match the original hole.
What's next? There's one more fork-shaped doubler that needs to be flattened and prepared, prior to more paint priming.