1. There is a problem, the needle is rough and bent. The hole is not smooth, try changing the needle.
2. The needle is thin and thick, and the thread cannot enter the wire groove and it is easy to break.
3. If the upper line is too tight, the adjustment screw on the front of the machine head can be adjusted.
4. Check if the distance between the needle and the suspension cable is too close when it reaches the bottom, and then adjust it.
5. Is the cleaning not very good? Is the lubrication keeping up?
6. Whether the quality of the second line is not good.
7. The needle is too thin and the fabric is too hard.
