Bernina E 16 PRO User Manual page 31

Cleaning the Bobbin Case
You should clean under the tension spring of your machine bobbin case every time you change the bobbin.
Lint and bobbin wax can build up under the spring, and this can affect bobbin tension. This, in turn, will
impact sew quality (loose bobbin, bobbin showing on front side of sew out, thread breaks, false thread
breaks). To clean under the spring, slide a corner of a small piece of paper under the tension spring in the
same direction the thread travels. While cleaning under the tension spring, be careful not to bend the spring.
After cleaning the bobbin case, blow the case out with compressed air. It is also recommended that you check
the bobbin tension.
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