Easy to use Sidewinder Portable Bobbin winder that winds bobbins separate from your sewing machine. This freestanding machine is portable and lightweight. Wind bobbins without a sewing machine. Discount on Sidewinder Bobbin Winder Wind metal or plastic bobbins. Adjustable tension knob. The SideWinder comes with a UL-approved AC power cord/adapter (included) or runs on two AA batteries (not included). Automatically shuts off when the bobbin is full. The sidewinder works with most bobbins except with Husqvarna/Viking and Singer Centaur bobbins. Features a convenient flip top. 3x5-1/4x3-1/2in. Instructions are included. Also see Sidewinder Bobbin Winder instructions here.