Hmmm... Wonder if the backer rod that you use for insulation or in gaps in general would give you the same result.
Now that I am thinking of it, it might be cool to try taking a piece of that foam, and using a big needle, threat some yarn through it a couple times then run your hook down the center.
That way your tube not only floats, but has some place to squirt some scent and have it stick.
I will have to try that out.
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