Peres Pereira01-09-2021 The defect could be the thread quality, there could be a problem with the thread tension, and it could also be the needle quality. Experiment with a line of 100% polyester or mercerized cotton. Try changing the needle for one of recognized brand and quality (Singer, Schmetz or Milward). With the presser foot raised, try to pull the thread back and forth and check if the tensioner holds the thread; do not catch the thread when with the presser foot raised.
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