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Old 10-15-2015, 06:27 AM
  #2  
Sewnoma
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Join Date: Jun 2012
Location: Sonoma County, CA
Posts: 4,299
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I thought Singer 15's took class 15 bobbins but the 500 & 503 took class 66? I have a 500 and I'm almost positive it takes 66's. I don't think a 15 would fit(?)

I'm not sure what that middle bobbin is though, sorry. Maybe an L?
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