This may be your answer. It is written in the description of Doug's PSK inside the "expanded with pictures" section.<br><br><br>"The plastic bobbin around which I wound the fishing line had slightly domed ends which I filed and sanded down so they were flat, significantly reducing the overall height and making it easier to pack."<br><br>I'm not really sure what kind of bobbin it is, but I wish I had one. My fishing line is more or less a big loop with a piece of tape in the middle.<br><br>