20. Pull one rubber band strand over the paddle blade, sandwiching the blade in between.21. Repeat with the second rubber band on the blade opposite the first. The bands will go around the center of the paddle wheel.
22. To operate the rubber band powered tugboat, wind up the paddle wheel holding the boat in your left hand with the stern closest to your body and rotate the paddle wheel in a counterclockwise direction until the rubber bands are tightly twisted. Keep a hold of the paddle wheel, place the boat in a large deep puddle of water or a pool and release the paddle wheel.
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