Pfaff creative 4874 Instruction Manual page 127

Thread Tension
If the needle threads (blue, green and red)
are too loose, adjust the blue, green and
red thread tensions to a higher setting.
If the needle threads (blue, green and red)
are too tight and the fabric is puckering,
adjust the blue, green and red needle
thread tensions to a lower setting.
Note: The stitch formation
adjustments for programs 26,
27 and 29 are based on those
for program 25.
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