Estes Hi-Flier XL, #3226 Build, Part 11, Baffle Gluing

Before gluing in the coupler, roll over the lip of the body tube. The small turned over edge can slow down the coupler slide.

When the top and bottom of the baffle ends were sanded even with the sides of the red coupler, the outside diameter was taken down a bit. Sometimes kit provided couplers are tight and can freeze up before they are all the way into the tube.
Do some dry fits before using glue and make sure the coupler slides in easily.

I tied on a long 1/4" elastic shock cord to the Kevlar line.
The elastic was fed through the upper tube before gluing the upper half of the coupler.

The trick is to use enough glue so the coupler won't sieze up, but not so much that the glue dries and shrinks up the tube making a recessed ring.

Again, turn the upper tube to even out the glue ring making a smooth fillet inside.

A Q-tip was taped to a dowel to remove any excess glue.