Old 07-29-2009, 05:17 AM
  #5  
Cathe
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Join Date: Jul 2007
Location: Minnesota
Posts: 1,097
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It's helpful with curved piecing, triangles (especially then they are not 45 degrees), and when you have inset corners or are sewing by hand.

You don't have to use them unless you want to, of course.
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