Underwater, the magic of a shakyhead worm actually happens at the opposite end of the bait. Angler shakes rod. Line sends pulses down to jighead. In theory, the worm’s tail dances, quivers and attracts interest from bass. But if it’s made from traditional PVC plastics, the bait eventually sinks back to the bottom and (pardon the pun) imitates worm food; stops moving; dies on the vine. You get the picture, and so do the bass. If the allure of shakyhead…