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josephblairAug 21, 2025
What to do if my SunStar SPS/C-B1201 Sewing Machine thread breaks?
- YyhartAug 21, 2025
If your SunStar Sewing Machine experiences thread breaks, several factors could be responsible. It could be due to incorrect thread insertion or wrong needle installation (height or direction), so try reinserting the needle and threads. A damaged needle (bent, cracked, or with a distorted tip) can also cause this, so replace the needle if necessary. Check the thread tension, as excessive tension in the upper and lower threads or in the thread take-up lever spring can lead to breaks. Adjust the tension accordingly. Lastly, inspect the shuttle surface spring for cracks and replace it if needed.