These root doublers are no officially the biggest pain in the ass things on a Sonex; at least up to now. There are no hints on the plans about how to set the holes, and after lots of back and forth fittings and careful drilling, this one really sucks. I can't even take a picture I'm so disgusted.
I have a plan to "fix" it that involves adding new rivets in new locations, and pulling rivets in the bad holes just to fill them up; they won't actually be doing anything.
