This nut tightens the tension on the discs in the tension unit that the upper thread goes through. Watch the video, under the video tab, if you need to know how to put the tension unit together, or if you are unsure about what piece you need.
This nut tightens the tension on the discs in the tension unit that the upper thread goes through. Watch the video, under the video tab, if you need to know how to put the tension unit together, or if you are unsure about what piece you need.