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Needle and string as frequently-use tools,while,often bring in trouble when we use them.It is hard for us to find the end of the string."The V" string shaft is justt designed to solve this problem.Make a small cut on the shaft and we can put the string into it so that in the next time we can easily to find it.
Zhihong Li Jianfang Zhang Shuang Li Weisi Cao