Strong call of Kenmore
This machine has been in my sewing room for many years. I love it more than all my newer models. There is a bobbin case that the bobbin goes into. It has a lever type handle that keeps the bobbin in while you pull the thread into the groove for it and then recesses when placed into the shuttle. There is a tiny screw on the bobbin case that controls the tension on the bobbin thread. I do not know where you will find one. Ask around the web and you may find someone with one. Good Luck.