Just keep turning the crank on the ball winder and guiding the yarn off the yarn swift and you'll have a finished ball in no time. The swift automatically turns along with the ball winder to keep feeding yarn onto the winder quickly and smoothly.
Once you get the hang of the operation, it's easy to wind a 50 gram ball of yarn in a minute or two, compared to the probably 10 or 15 minutes it would take to wind by hand.
Both pieces of equipment are investments that not every knitter can make (or even needs to make) but if you buy a lot of yarn in skeins these tools are great to have at your disposal.
