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If you own a BERNINA 9mm machine like: A model 1630,180, 200/730, 640, 580 or a 830/820 machine, the bobbin case has a little flat spring at the bottom of the case where you insert your bobbin. Sometimes this spring comes out during cleaning or when a thread gets caught. This video will explain to you why we have this spring in there in the first place and how to replace the spring if it came out.
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