Louet is supplying bobbins with a new black plastic core. This core has a small hole with a slit at either end (as shown in image). To use this, simply tie a knot in your leader yarn and slip it into the hole in the bobbin core. Then slide the yarn into the slit so that it is held tight.
There are many accessories and parts for spinning and parts that you may wish for your wheel. On these pages all of these various accessories are described.