Watch and learn about several of the different bobbin sizes, what machines they work in and how using the wrong size can affect your stitch quality.
Understanding Different Bobbin Sizes, National Sewing Circle
Bobbin Styles & Shapes Bobbins, Sewing essentials, Sewing machine accessories
Bobbin Sizes: Understanding the Sizes of Bobbins
2 National / Eldredge Sewing Machine Bobbins, Shop Madedamascus
Bobbin Case for Singer 15-88, 15-90, 15-91, 15-125, 177C, 293B Sewing Machines Backward Latch 11 O'clock
Understanding Different Bobbin Sizes, National Sewing Circle
Understanding Different Bobbin Sizes, National Sewing Circle
Sewing Basics: All About Bobbins - Underground Crafter
Bobbin Work, National Sewing Circle
Understanding Different Bobbin Sizes, National Sewing Circle
Works best with new Brother models which no tension adjust screw on its bobbin case, to avoid the bobbin thread shows on top of fabric This is Size A,
DOUBLELIN 144pcs Prewound Bobbins Size A for Domestic Sewing/Embroidery Machines, Compatible with Brother Machines, Plastic Sided, Size A, Class 15
Help in finding bobbin case and bobbin for a National Sewing Machine Rotary A2. : r/vintagesewing
Proper Bobbin Use National Sewing Circle
Proper Bobbin Use
Understanding Different Bobbin Sizes, National Sewing Circle