Step 6Secure your glass-on fins.
So. Slip on those tennis balls.
Then cut your dowel or stiff cardboard cylinder to span exactly the length between your two side fins.
Throw on as much tape as is needed. (more is better)
Your center fin really doesn't require that much stabilization as it's the cant on your side fins that makes them more likely to be damaged. But tape that tennis ball on the center fin anyways.
Now jam a towel in between all your fins and, once gain, tape away!
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