Continue winding the yarn from the ball onto the chair back until you come to the end of the ball.
Untie the end of the yarn that is attached to the chair.
Using another length of yarn -- which can be the same yarn or a contrasting yarn, as shown here -- tie the hank strands together in at least a couple of places to secure the ends and make sure the yarn doesn't tangle when you take it off the back of the chair.
These strands should be tied tightly enough that they hold the hank together but not so tight that they won't allow the fibers to move around, which is essential if you're planning to wash the yarn after skeining.
