I read on here where someone said with fluorocarbon you need to tie a swivel to it and attach it to a tree or something and stretch it out before you use it. my question is why do you need to do this?

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I read on here where someone said with fluorocarbon you need to tie a swivel to it and attach it to a tree or something and stretch it out before you use it. my question is why do you need to do this?
