There was a company that was making those w/ a regular snap swivel. I bought them at sportco and used them for a season. Have not been able to find them since. I forget the name of the co. but remember the package. I belive the name started w/ a D. White package and they mainly sold swivels/silders ect. Lower end products. They worked great in some conditions.
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You don't catch fish, fishing catches you.