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A correct stitch will be as the illustration shows. The upper
and lower thread tension are equal and strong enough to
lock both threads in the centre of your fabric.
Always test tension on a scrap of the fabric you intend to
use before commencing sewing.
1.
If the upper thread is too tight, the lower thread will be
pulled up tightly to the top of the fabric, and you will it
stitch on the surface of the fabric. Balance the tension by
turning the thread tension dial anti-clockwise to the
correct tension.
2.
If the upper thread is too loose, the upper thread will be
pulled tightly to the bottom of the fabric and you will see
the lower stitch thread on the bottom of the fabric.
Balance the tension by turning the thread tension dial
clockwise to the correct tension.
Adjusting thread tension
Upper thread
Lower thread
Lower thread
Lower thread
Fabric
Fabric
Fabric
Upper thread
Upper thread