Fishhound.com reported today on an intriguing innovation out of Japan: a crankbait weight that will randomly cause a plug to "kick out" and possibly induce strikes that otherwise wouldn't occur. It looks like a small lead ball inside a spring and it attaches to the rear treble hook.
You can see how it works on the accompanying video. It's a Zappu product, and the article mentions that it's not known if it'll become available in the U.S.
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