Not only it is important that a serving tool simply serves the yarn on a string: it is much more important, how this is done! The yarn must have a smooth guidance; friction and tension must be adjusted extremely fine.
This is possible thanks to the Beiter Winder. A unique feature of the Beiter Winder is also that the yarn must not be threaded through an eye: thanks to an innovative slot you have only to clip in the yarn!
Another unique property of the Beiter Winder is that you can change the spool within seconds.