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Old 02-20-2014, 10:11 PM
  #9  
Candace
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Join Date: Jan 2010
Location: Outer Space
Posts: 9,319
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I have over 30 sewing machines and have never needed any. If you know the mechanics of a sewing machine and how to adjust the tension via the top tension guide and bobbin case, it's not something I've ever had an issue with!
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