PR670E / PR670EC FAQs & Troubleshooting PR670E / PR670EC Not your product? Sort by Updated Date Popularity 3 Results 1. 10/03/2022 How do I delete short stitches ? 2. 15/10/2021 How do I adjust the tension of the upper thread ? 3. 25/08/2017 How do I thread the machine? (Threading the upper thread) Getting Ready FAQs & Troubleshooting