Screw, Attachment, Bobbin Case Tension Spring
This tiny screw is the one that attaches the bobbin tension spring onto the bobbin case. Looking at the bobbin case with open end facing down and the screws toward you, it is the one on the left. It is different from the adjustment screw on the right and they are not interchangeable.
Fits original Singer and most aftermarket bobbin cases for the 221, 222, and 301.
