Very annoying if we see that jump irregular stitches . Which was originally
neat stitches become irregular . Sometimes the long jump for the upper thread
is not related to the thread inside the lifeboat sewing machine .
There are several reasons that make the yarn is not stuck to the bottom of
the thread , including :
1. The lever thread worn
2. The needle is not matched with the machine
3. Sewing machines were rarely serviceable
4. The location of the needle that is too high or too low
5. Number needles that do not fit with the type of fabric sewn
6. Cain too thick is not in accordance with the needles used
7. The clamp threads that are too tight or too loose
There is another addition ?
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