Add Yahoo as a preferred source to see more of our stories on Google. When I was 16 and newly minted with a South Carolina driver's license, I signed up for my first sewing class. After a few days of ...
*1.5 is a factor based on the average loop strength ratio of most sewingthreads. =10 SPI X 4.0 lbs. X 1.5 = 60 lb. strength 401 Chain stitch Estimated Seam Strength =SPI X Thread Strength (lbs.) X 1.7 ...
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