CV3550 FAQs & Troubleshooting CV3550 Not your product? Sort by Updated Date Popularity 5 Results 1. 02/02/2018 Adjusting the thread tension dials 2. 25/01/2018 Turning direction of handwheel 3. 02/08/2017 How to adjust the stitch length 4. 01/08/2017 How to adjust the looper thread tension 5. 01/08/2017 Opening and closing the front cover More FAQs (English only) Operation FAQs & Troubleshooting