Re: Janome 550e


re  the bobbin thread being brought to the top of the design.
Make sure that you have the bobbin in correctly. If you have it in backwards it will pull the bobbin thread up to the top.
Look carefully at the diagram on the bobbin cover, it shows that the thread comes off to the left (counter clockwise) and then through the tension.
Other issues could be the type of bobbin thread you use and which bobbin case, the yellow dot case has a tighter tension which may help your problem.

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