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I have a Singer K99
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03-22-2012, 07:53 AM
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Candace
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Join Date: Jan 2010
Location: Outer Space
Posts: 9,319
These vintage machines were manufactured to use metal bobbins and the weight of the metal does help them sew better and keep better thread tension. Yes, a plastic one will work, but the metal ones it was designed to use will work better.
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Candace
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