Bernina 790 PRO Manual page 49

Sewing Preparation
> Pull the thread into the slot (2) from the left.
2
> Pull the thread to the right under the spring (3), then pass it below the two thread guides (4) and pull it
upwards.
4
3
> To insert the bobbin case into the machine, hold it so that the thread guide (5) points upwards.
5
> Insert the bobbin case.
> Press onto the center of the bobbin case until it engages.
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