Once wound, the bobbin must be placed correctly into its case under the needle plate. This is often the most common point of user error. The thread should usually unwind clockwise as you drop the bobbin into the case. Then, guide the thread through the small slit and under the tension spring until it emerges from the side of the case. You should hear a slight click when it is properly seated.
Once you have your manual, you'll need to learn the key parts of a typical mechanical sewing machine. These often include: manual maquina coser toyota 2800