Duerkopp Adler 558 Service Instructions Manual page 47

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With inserted cutting block and cutting knife turn the cutter bar into
its lowest position with the hand crank.
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Loosen screws 2.
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Pull the upper thread puller into its lowest position by sliding the
rod 1.
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Tighten screws 2 again.
Attention !
Retain the safety clearance to the machine arm.
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Check the setting with a sewing trial.
If the excess thread end at the seam beginning is too long set the
thread puller to less thread pulling at the rod 1.
1
2
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