Innov-is F420 FAQs & Troubleshooting Innov-is F420 Not your product? Sort by Updated Date Popularity 3 Results 1. 04/03/2023 How do I thread the machine (Threading the upper thread)? 2. 04/26/2022 How to adjust the thread tension 3. 12/26/2016 How do I sew with the twin needle? Getting Ready FAQs & Troubleshooting