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needle plate and then picked up a certain bobbin and other placement is incorrect, or the shape and size is not standardized parts will lead to job failure neat disconnection usually always by suture needle penetrates too long groove direction line hole in the direction of the arc slot piercing, needle trough aka Yung trunking, it makes most of sutures in the sewing process reduces friction, making it smooth and orderly shuttling among sewing materials ; the arc groove makes the suture line with its curved
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