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Why Does my Sewing Machine Clump the Bobbin Thread?
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02-03-2013, 07:30 AM
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craftygater
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Join Date: Jan 2012
Location: Belleville, MI
Posts: 142
i have both a Topaz 20 and a Singer heavy duty and it happens on both. It usually is the thread coming out of the uptake lever on the front. Sometimes it doesn't come out but wraps around another time and becomes tighter.
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