Took all of the skins off and started deburring. I also had to repair one of the channels on rib #9. The wing skin hole was directly over the channel so the drill hit it. Used my Dremel tool to grind it away to remove any stress risers and to provide clearance for the rivet.
I actually found another builder who had the same problem and that was the recommended fix from Sonex, so I felt confident doing it.
