The rings are glued in place on their 1/2" marks made earlier.
Tie the Kevlar with a small square knot. Cut the loose tail off at about 1/2" long.
Press the Kevlar loop, knot and tail into the glue fillet.
Slide the heat shrink tube down the Kevlar line until the end rests on the upper centering ring.
While holding the heat shrink tube against the upper ring -
Apply heat using a hair dryer or heat gun on the low setting. It should shrink around and tighten over the Kevlar.
When tying the Kevlar knot, make it small and tight against the motor mount tube. There isn't much space between the BT-20 and BT-50 tubing.
Notice the Kevlar relief notch is to the outside edge of the upper ring. This keeps the Kevlar to the outside of the hot ejection charge.
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