Hi I am totally new to sewing machine. I got an old singer 621B but I have trouble to make up threading correct, can anyone help?
i am not sure on the tension knob has a pop out spring is right or wrong
please see attached picture link
https://drive.google.com/file/d/1pjV...w?usp=drivesdk
https://drive.google.com/file/d/1mld...w?usp=drivesdk
https://drive.google.com/file/d/1Ktf...w?usp=drivesdk