Day 8: Got my centering rings in. Now I can start working again. So I started by gluing the forward and middle ring onto the motor tube (middle ring is stock paper one) using ProBond. I don't glue on the aft ring so that I can access the fin tabs after installation. Then I gave the rings epoxy fillets for more strength. Then I realized I needed to stop and think about how I want to install my rail buttons so that I don't have to keep them on while painting.