There are many reasons you might want to ply from a center pull ball rather than from your bobbins. For instance you might only have one bobbin. You might have two bobbins, but only one is full and you don't to waste any of your singles. Just wind into a center pull ball and ply from both ends. A word of warning, though: No matter how lazy kate is, she's not going to help you with this! And the outside will always unravel at warp (;>) speed compared to the inside. This can lead to some serious tangles if you're not careful. When using this method, I always use a drop spindle instead of a wheel. I've found that placing some sort of weight on each side of the ball helps. Placement must be strategic, though, so it doesn't impede the movement of either strand. I've become adept at using my left foot to control the draw. Don't worry -- I always clean my feet and the yarn gets washed again before the finishing process to set the twist!
