I bought a package of Bobbin Genies and they really work. I haven't had a bird nest at all. They prevent static which causes backlash in the bobbin. Also Fil Tec makes commerical prefilled bobbins with a tiny magnetic core that keeps the bobbin perfectly in place. Now they make them for home machines. They work great for machine quilting, no backlash at all. Not for drop in bobbins though.