Bernina 7 Series Manual page 79

Height compensation of uneven layers
Sewing corners
The feed dog works accurately when the foot is level.
If the foot is at an angle, e.g. when sewing over thick to thin or vice-versa, the
feed dog cannot grip and feed the fabric. The fabric might jam.
To solve this problem, place one, two or three compensating plates as required
behind the needle under the presser foot to level it.
To correct the height in front of the foot, place one or more plates under the
foot close to the needle. Sew until the foot is level again and remove the
plates.
Needle stop down.
Due to the width of the stitch plate hole the outer feed dog rows are relatively
far apart.
When sewing corners only a small section of the fabric is actually on the feed
dog. Therefore it cannot grip the fabric well.
Place one or more plates of the height compensation tool parallel to the
presser foot close to the edge of the fabric.
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the fabric is fed evenly
Needle stop down.
Practical stitches Practical stitches
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