Countersunk one hole in each of the FF-01226C Drip Tray Stiffeners and the corresponding holes in the Drip Trays and squeezed flush rivets. I misread the instructions and assumed flush rivets were needed to attach the stiffeners to the trays. So, I countersunk all the outside holes and used AN426 AD3-4 rivets. I wasted over 30 minutes doing this but the drip trays will look nicer. Attached the FF-01226D Doublers to the trays using fuel tank sealant. Sealed the holes in the drip tray corners with sealant.
