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Old 01-06-2020, 07:16 AM
  #22  
Onebyone
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Join Date: Jan 2011
Location: Southern USA
Posts: 15,975
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Well I searched for code 4021 for Pfaff sewing machines. I got a video explaining what can be done and undone using the code. It isn't that scary but it's best to know before changing anything.
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