OR Spaced Needle Build, Part 2, Kevlar and Coupler

I learned something on this build. Really tall rockets have different needs.
The version built here was two 18" tubes glued and coupled together. Long in transport, tall in flight and recovery.
This rocket flew and recovered fine with A8-3 and B6-4 engines. Problem was, transporting such a tall rocket. On the drive back from a club launch, equipment shifted in the back of the car and bent the tube beyond repair. While the heavy walled BT-20 is much stronger than a standard BT-20, the weight of the shifting cargo still bent the tubes.

I'll show how I built it the first time, two tubes glued together. For easier transport, I'd recommend building a long, thin rocket that separates at the middle.

The brown coupler had to be sanded a bit for a sliding fit in the tubes. This is typical of brown couplers, they are a tight fit.

For shock cord retention, some 135 lb. Kevlar was tied around the entire length of the coupler.

Some braided Kevlar ends will fray.
To clean up the end, put a bit of white or yellow wood glue on the end. Spread it our with your fingertips and let dry.

TIP: Never use Super Glues (CA) on Kevlar, shroud lines or elastic. Super glues will run up the line making it brittle and weak.

Now with the Kevlar stiffened out, you can make a clean cut.
I use wire cutters. Cutting with a hobby knife will really dull your blade.