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Gapped sewing coil
It is difficult to find the head of the line on the sewing coil because it's very small,especially to the elderly and people with poor eyesight.
This design set a gap on one end of the sewing coil, then you can fix the line head on it after you used,in order to provide convenience for the next use.
Tao Hu Runrun Zhang Liya Dou Shiping Liu