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Hello,
Now we seeing about changing a Needle Bar for Siruba 4 thread OverLock sewing machine. This methode suitable for all kind of overlock sewing machines. I explain in video with perfect methode. I posted many videos about sewing machine repairs. I give that playlist link here rb.gy/rpw7j9
When it is required to change?
The Needle bar was shaking or the Needle was brokening so much time, It required.