Pfaff ClassicStyle 1525 Owner's Manual page 33

Perfect tension
Too high tension
Too low tension
Needle thread tension
To get perfect sewing results, the needle
and bobbin thread tensions must be
perfectly tuned to each other. The normal
setting for utility stitches is in the range
of 4-5.
Check the tension with a wide zigzag
stitch. The threads must be interlaced
between the two fabric pieces.
If the needle thread tension is too high
the threads are interlaced above the top
fabric. If the needle thread tension is too
low, the threads are interlaced below the
lower fabric.
The adjustment of the needle thread
tension is described on page 1:15.
Topstitching
Straight stitch G can be sewn using any of
15 various needle positions in such a way
that you can always guide the sewing
foot along the fabric edge for top-stitching
work. The top-stitch needle position is
determined by the needle position dial.
B
If you wish to top-stitch farther from the
fabric edge, simply guide the fabric along
the guide marks on the needle plate or
A
use the edge guide (standard accessory
No.8). The edge guide is inserted into
hole A and is secured with xing screw B.
Sewing aid for thick seams
To ensure a consistent feed when
beginning sewing at a thick seam, we
recommend supporting the presser foot
on a piece of fabric of the same height as
the workpiece
2:3