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pinhole is too small to through,it has been becoming a common trouble in our daily life.We changed the pinhole to a rubber ring,which is acerose and soft.The rubber ring will become a perfect circle when we threading.This desigh makes threading more quickly and accurately.
NanChang Univercity
College of art and design
NanChang Jiangxi province, China
Xinxin Wang,
NanChang Univercity
