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Jerk cords are effective but take a lot of motion to activate and are difficult to set up. Spinners are great and attract birds but can flare waterfowl if not set up properly. To put more birds in your bag, you need effective action in your decoys to get weary birds to commit. JERK BUTT SYSTEM (JBS) is your answer. With patent pending Easy-Jerk (TM) technology nothing is simpler to set up and use. Economical, no batteries required and, most importantly…deadly effective.