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Are these prewound bobbins?
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12-01-2016, 05:13 AM
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Onebyone
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Join Date: Jan 2011
Location: Southern USA
Posts: 15,950
Superior has excellent educational articles about thread and bobbins.
A few facts about pre wounds:
http://www.superiorthreads.com/educa...acts-and-faqs/
And there is a top and bottom side of prewound bobbins.
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