The link to quiltville blog is the correct threading of your machine as Janey so kindly provided. The upper tension spring is a good system turn screw in to tighten and out to release some tension. Once set you will not have to bother with it again except for special sewing requirements. This machine uses 20X1 but you can use a 15X1 needle by cheating it down enough to catch the bobbin thread. It will then sew perfectly. Very easy to treadle this machine. I use mine all the time with the 15X1 needle.
Last edited by Glenn; 06-03-2017 at 05:23 AM.