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Mend Bernina Bobbin Case

How do I adjust the bobbin tension in my 730 Bernina?

I am sewing on a 730 Bernina and believe I need to adjust the bobbin tension. There are two screws on my bobbin case; a small one and a larger one, which one would I adjust. The reason I think this is the problem; as I sew the bobbin thread pulls up on the right side of the fabric causing me to be able to literally pull the top thread out as tho I was basting something.

Terrie
November 2009
BerninaHousehold Appliances, Sewing MachinesBobbin Bernina Case
Hello Terrie,
You adjust the large screw, only turn the screw a quarter of a turn at a time clockwise to tighten then test sew, you should just be able to pull the thread through with slight resistence, make sure the bobbin turns anti clockwise

drivewithken
November 2009

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