sup (stand up paddle) fin
thingiverse
I bough a home depot (futur beach) stand up paddle. It comes with a ridiculously small fin. Paddle on left, it turns right. Paddle on the right, turns left. But you stay on place. So I printed a larger one. Works well, than you can go forward! You'll need a 8/32 screw that you will cut the right size.
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