221 Class Bobbins

Class 15, 66, and 221 Bobbins: What's the Difference? #shorts

How to Wind Bobbin and Thread Bobbin Case for Vintage Singer Featherweight 221 Sewing Machine

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Sewing Machine Bobbins: What Size/Class Should You Use in Your Machine? Are They Interchangeable?

How to pull apart and reassemble the bobbin case area on a front loading sewing machine

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How To Correctly Use a Featherweight Bobbin Case (Getting to Know Your Featherweight, Part 2)

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Bobbin Sizes: Understanding the Sizes of Bobbins

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Singer Featherweight 221K - How to Thread the Sewing Machine Tutorial

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Singer Featherweight 221 222 Video Tutorial - Thread Jam Removal Tool

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Singer Featherweight 221 222 Repair Video Tutorial - Thread Jam

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Bobbin Winder Servicing Tutorial for the Singer Featherweight 221 222

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How to Thread Singer Featherweight 221 Sewing Machine Bobbin Case and Upper Tension and Wind Bobbin

Marklar1 (Marklar1)

Exploring Sewing Machine Bobbins: Plastic, Metal, And Vintage Options!

Wynema Chilianis

Vintage Sewing Machine Bobbins: The right bobbins for your vintage sewing machine

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Understanding Bobbins: What You Need To Know

Sewing Parts Online

Singer Class 15 vs Class 66 bobbins.

Singer 221K1 Sewing Machine

Featherweight 221 Bobbin Case Comparison of Original to Aftermarket

How To Adjust the Bobbin Case Tension

Featherweight Shop

Singer 221 featherweight aftermarket bobbin case modifications