DURKOPP ADLER M-type 867 Service Instructions Manual page 62

3. Setting the spring tension: Turn the tension disc (3):
4. Tighten the screw (4).
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• Greater spring tension: Turn to the left:
• Less spring tension: Turn to the right:
Do not twist the stop collar in doing so.
Setting needle thread tension
Service Manual 867 Version 02.0 - 04/2015