Thread: Why Does my Sewing Machine Clump the Bobbin Thread?
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Old 02-01-2013, 01:09 PM
  #2  
trivia42
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Join Date: Jan 2013
Location: Kansas City, MO
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Tension would be the first thing I would check, both bobbin and top. After that I would make sure the timing is good, if you're hitting the bobbin case with your needle instead of going through the hole in the case you may need to have it looked at.
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