EX-660 FAQs & Troubleshooting EX-660 Not your product? Sort by Updated Date Popularity 4 Results 1. 10/15/2020 The bobbin thread cannot be pulled up. 2. 10/15/2020 The machine does not make stitches 3. 12/12/2018 When thread got tangled. 4. 10/23/2015 Why does the lower thread keep breaking? Sewing (Character Decorative Stitches) FAQs & Troubleshooting