James,<br><br>I used a home style sewing machine bobbin. You can pick these up at any sewing goods store, as well as many drug stores and hardware stores. Usually four to a pack. They are a more or less standard size and come in plastic and metal. I used plastic and first sanded down the slightly domed ends so they were flat. Made it easier to pack and takes up less space. Note that monofiliment wound this tight will tend to take a set. I haven't found it a significant problem, but it does look somehting like a telephone handset cord for a while. <br><br>http://sewing-machine-parts-store.com/pa...&page=1