Preparatory work
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4.4. Inserting the bobbin case
Hold the bobbin case so that the finger of the case is pointing upwards.
Open the rocker arm of the bobbin case.
Put the bobbin case on the central pin and press the case in carefully until
the finger of the bobbin case goes into the shuttle track ring.
Let go of the flap and press on the bobbin case.
Close the bobbin case cover (10).