PR-620/620C/600II/600IIC FAQs & Troubleshooting PR-620/620C/600II/600IIC Not your product? Sort by Updated Date Popularity 2 Results 1. 16/06/2014 How do I thread the needle. [Video instructions] 2. 16/06/2014 How do I thread my machine (Threading the upper thread). [Video instructions] Instructional videos FAQs & Troubleshooting