Bernina L 890 User Manual page 82

Machine settings
Gather to fit
This setting for gathering can also be used to deliberately ruffle the material and helps to reduce seam
waves.
> To prevent waving, increase the differential feed to a value between 1 and 2.
Stretching 0,7
The front feed dog with the setting value 0,7 travels a shorter distance than the rear feed dog. This setting
can also be used to deliberately stretch the material and to prevent seam puckering.
> To prevent seam puckering, reduce the differential feed to a value between 0,7 and 1.
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