Innov-is 500D FAQs & Troubleshooting Innov-is 500D Not your product? Sort by Updated Date Popularity 2 Results 1. 12/12/2018 It is difficult to pass the thread through the needle bar thread guide(hook). 2. 02/25/2009 My auto threader is not working. What should I do? Preparation FAQs & Troubleshooting