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There are many difficulties in threading a needle for the sewing needle in being. Further more, the pinhole is easy to be broken off as it's not strong enough in the part of pinhole. In order to resolve the two particular problems upwards. The design have rebuilt the pinhole, and changed the method of threading a needle. There are two procedures of the design in detail. First , make the fringe of pinhole into placket, and then put the thread into to pinhole through placket. Second , dwindle the pinhole and let it in the side. Which, will make the pinhole stronger.
Tingxin Yu Yongyi Li Lin Wang