Check bobbin area. Clean feed dogs with brush to remove lint balls & any loose threads. Use gentle back and forth motion on hand wheel to see if you can loosen debris. Be VERY gentle so you don't interfere with timing. Usually you will bring up one thread caught in feed dogs and you can sweep it out. If that's case here, I recommend inserting new needle, flat side back and make sure you raise presser foot before rethreading to open tension discs. Good luck. Jimmy
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