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Old 12-22-2020, 06:59 PM
  #4  
Peckish
Super Member
 
Join Date: May 2011
Location: Pacific NW
Posts: 8,127
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The troubleshooting section of my manual says to check these things:
1) Threading is incorrect
2) Wrong needle for the fabric and thread in use
3) Upper thread tension is too high
4) Bobbin tension is too high
5) You're sewing a lightweight fabric with the feed dogs in a heavyweight position
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