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The ST-718 tube was cut 4 1/2" from the top for a payload section using my Odd'l Rockets CUTTER tool.
This upper section will also hold the clay nose weight.
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I just kept sanding away at the outside of the scrap balsa shoulder until it fit into the coupler.
It was glued inside overhanging the edge. After the glue dried, it was sanded flat.
To the left is 1/4" long BT-20 scrap that was split to make a engine hook retainer.
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