True Modeler's Rocket Kits NASA Scout Build, Part 5, Nozzle and Engine Mount

On the left is the instructions for setting the nozzle on the low end of the engine mount. There's no reason to do an upper glue bead on the BT-20 tube. Just do a line of glue on the upper edge of the 20/50 ring.
When the 20/50 ring is slid in place it will get glue onto the top shroud joint.

A thick brown 20/50 ring is glued on top of the small end of the shroud.
Apply glue around the top -


and slide the flat 20/60 centering ring down on top of the brown 20/50 ring. Turn the flat ring in the glue bead to smooth it out.

Before applying glue fillets, CA glue was applied to the outside of the lower exposed 20/50 ring. It can be lightly sanded and will look like plastic when the model is painted.

The upper ring is glued in place and fillets are applied to all joints.
I used  Q-tip to remove the excess glue from the tight joints.

Instead of using the very small, 20 lb. tri-fold mount - Some 150 lb. Kevlar was tied into a notch in the engine block.
Here it is fed through the back of the engine mount tube to keep it out of the way.