The true DIY and craftsters don't just use all the cool toys and materials - they want to know how they work.
So, bone up on your sewing machine saavy - sure, everyone knows that there are two sources of thread, but peep the above animation to see exactly how the two become tangled. Also makes all those tensioning dramas make so much more sense.
See this and lots of other cool machine animations at World of Technology.
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