Bobbin Case Tension Adjusting Screw, Singer, Part Number 591

For bobbin cases with Singer part numbers of JO1313, JO1313Z, 125291, 105032, 173058, 9076-A, 52237TOWA.

You will receive one very tiny screw.

If you are unsure if you need this one, please tell us the model of your Singer, and we can most likely tell you if this is the correct one.