Pfaff 521 Instruction Manual page 59

By pressing "+" on the corresponding +/- key change to the third seam section.
In the third seam section
- the stitch length (for roller presser and feed wheel) should be 3 mm
- a stitch count should be carried out (2 stitches),
- and the seam should be sewn in reverse.
PM
3
3
By pressing the corresponding +/- key set the stitch length for the roller presser
at "3.0 ".
By pressing the corresponding +/- key set the stitch length for the feed wheel at "3.0".
By pressing the stitch count key, switch on the corresponding function.
The display changes for the input of the number of stitches.
If the stitch count function is already switched on, change by pressing the Scroll key.
PM
3
3
By pressing the corresponding +/- key set the number of stitches at "2".
By pressing the corresponding key, switch on the reverse sewing function.
By pressing "+" on the corresponding +/- key change to the fourth seam section.
3.0 3.0
2
Input
11 - 12