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I think when the fish come in the shinner gets spooked and the rattle rattles trigering the fish to strike more aggresively
I have been useing red beads and a spinner the whole year. Seems to out perform my other tipups. Just can't use to big a spinner too close to the minnows. I like to keep em about 3 inches up on the leader.
Actually, the marabou is either tied to the hook or some how suspended up by the beads.