Pfaff creative 4874 Instruction Manual page 125

Thread Tension
If the deco cover threads (blue and yellow)
are barely visible, adjust the yellow and
blue thread tensions (45) of the deco cover
threads to a lower setting.
If the needle threads (blue and green)
are too loose and form small loops on the
underside of the fabric, adjust the blue and
green needle thread tensions to a higher
setting.
If the needle threads (blue and green) are
too tight and the fabric is puckering, adjust
the green and blue needle thread tensions
to a lower setting.
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