FAQs & Troubleshooting Popular HC14 Not your product? 37 Results 31. Why does the needle keep breaking? 32. Incorrect thread tension 33. Upper thread tightened up 34. How do I wind the bobbin? 35. How do I sew such as vinyl, leather, quilting layers and velvet? 36. The bobbin thread cannot be pulled up. 37. Fabric is caught in the machine and cannot be removed FAQs & Troubleshooting