Bernina 475 QE User Manual page 45

Sewing preparation
> Press the bobbin case release at the bobbin case (1).
1
> Remove the bobbin case.
> Remove the bobbin from the bobbin case.
> Insert the new bobbin so that the silvery sensor surface is facing the back of the bobbin case.
> Pull the thread into the slot (2) from the left.
2
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