Hello all I am in so much need of some sewing help. I took a sewing class back in high school, 10 years ago. I am currently trying to help my husband by sewing in tags for his clothing line. The sewing machine that I have is his mothers, a Kenmore from Sears. My problem is the bobbin, and tension. Can someone please walk me through how to tread the bobbin, and the correct tension. The back stitch is bunching up and it’s slowing me down. HELP!!!!