Estes Black Brant XII, Kit # 9723 Build, Part 22, Rear Ring & Retainer

With the fins in place, 

The third centering ring is dropped in and pressed down onto the rear of the fins tabs.

I applied some wood glue to the fin tabs before sliding the ring in place.

A wood glue fillet was applied to the tube/ring joint using a Q-tip.

The inside ring of the two-piece engine retainer is roughed up with 220 grit sandpaper for a stronger Epoxy bond.

Epoxy is applied to the outside of the engine tube and the retainer ring is slid over, down to the inside raised stop.

Turn the ring to spread and even out the epoxy.