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The streched needle can make it easier to thread.Afterthe string is put into the eye,we can make the ends together.And after use it,we can make it strech like before easily.
Wuhan University of Technology
Wuhan, China
Zhen Liu,
Wuhan University of Technology
Sufen Zhao,
Wuhan University of Technology
Chao Zhou,
Wuhan University of Technology
Jianmei Li ,
Wuhan University of Technology