The centering ring with the two holes is used in the upper adapter. A Kevlar loop is tied through the two holes. Some Centuri kits used a shroud line to tie the model together instead of a screw eye in a balsa adapter.
TIP: The coupler ends can be sanded for a flatter gluing edge.
Tubes and coupler ends are usually cut at a slight angle.
The centering rings are glued onto the coupler ends.
Lay the glue bead with a bit more on the inside edge. Set the ring on and twist it, making a more even inside fillet.
You can smooth the interior fillet and remove excess glue using a Q-tip.
The Kevlar in this kit was braided. To prevent fraying you can rub some white or wood glue on the ends.
TIPS: Never use CA (super glues) on string, cords or knots. CA glue will make the line hard, brittle and easy to break.
The instruction illustration shows a bigger loop than is necessary.
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