Why is the thread tightening quality poor on my SunStar SPS/B-1811?
- KKelly HenryAug 13, 2025
If the thread tightening quality is poor on your SunStar Sewing Machine, it could be due to weak tension of the upper or under thread, or improper timing of the needle and shuttle. You can adjust the tension of the upper sensor or readjust the timing of the needle and shuttle to resolve this issue.