Wait a minute, what's that bit about the mussel on the end of a string? After being smashed to smithereens, is the mussel expected to calmly clamp down onto the string and voluntarily be lowered into the water to literally feed the crabs? There's no easy way to tie on the mussel so it stays put long enough to work, so usually before you've even caught your first crab you're left holding a snarl of knots and surrounded by mussels in the water being greedily devoured by happy, uncaught crabs.
Fortunately, the above is now an image from the past. We're here to catch crabs, not to tie knots, and with nobody but the crabs to be impressed by our double-slipped triple-throw gordian bender when all they want is a bight, modern methods come to the rescue.
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It turns out a simple office binder clip can hold onto a mussel at least as tightly as a crab can, and can be easily operated even by a three-year-old who has yet to learn how to tie his or her shoes. Clip on, lower away, and out come the crabs just as fast as you can pull them up.
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Next: how to use binder clips in place of knots for mooring lines, sheets and halyards....