SINGER 6217 - Manual (Page 17)

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Adjusting thread tension
When an even amount of tension is exerted
on both threads, a smooth even stitch, known
as a balanced stitch, is produced.
Correct tension is important because too
much or too little will weaken your seams
or cause your fabric to pucker. Make a test
sample with the fabric and thread you plan
to use and examine it.
A perfect, well balanced stitch (1), will have
the needle and bobbin threads locked
between the two layers of fabric with no loops
on top or bottom and no puckering.
Too much tension will produce a tight stitch
(2) which will cause the fabric to pucker.
• To decrease tension, turn the dial to a lower
number.
Too little tension will produce a loose stitch
(3) which will cause loops in your seam.
To increase tension, turn the dial to a higher
number.
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