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Old 08-08-2019, 03:25 AM
  #10  
NJ Quilter
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Join Date: Mar 2011
Location: Central NJ
Posts: 5,572
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I wonder if your bobbins are wound too tight or too loose? I've had issues with tension with poorly wound bobbins in my (not vintage) machine. Now I tend to go a bit more slowly when winding.
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