Singer Class 15 vs Class 66 bobbins.
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Vintage Sewing Machine Bobbins: The right bobbins for your vintage sewing machine
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How to load the bobbin on every machine that’s ever been made. “ALWAYS COUNTER SLOT-WISE”(video 381)
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Singer 99K: Essential Details to Start - with diagrams, part numbers, and oiling instructions.
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Common Singer Bobbin Cases & Bobbin Case Tension Sunday Morning Quickies September 19, 2021
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Old Style Singer 66 Upper Thread Tension R&R - for Carol
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How I Clean & Adjust a Singer Class 66 Bobbin Case, like this Model 327K
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How to use a Singer Buttonhole Attachment
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