I liked the large spool holder. But it didn't satisfy me a bit. Therefore, some of its parts were redesigned.
The author remixed this model.
The cylinder on which the bobbin is put on is made with a continuous thread. The axis on which the cylinder rotates is elongated and has a thread at the ends. This allows you to slow down the spontaneous unwinding of the bobbin. The bobbin holders are made thinner, which will allow you to use a larger type of bobbin.