The bobbin should be placed in a certain location on the majority of equipment. The bobbin has to be threaded throughout the machine after you've located the proper location for it. A graphic illustrating how to thread your bobbin properly may often be seen next to the bobbin region on machinery.   You must wound thread around the bobbin once it has been threaded. Holding onto the entire thread tip is necessary when you crank the device's side roller to accomplish this. When the bobbin is filled, trim the extra thread, then reattach the lid.