Dürkopp Adler D869 e-con Service Instructions Manual page 77

Adjusting the needle thread tension
4. Turn the screw (4) to adjust the spring tension:
 The scale (2) of the spring balance (1) indicates the thread tension
5. Tighten the knurled nut (3).
Service Instructions D869 e-con - 00.0 - 09/2023
• Greater spring tension: Turn screw (4) counterclockwise.
• Less spring tension: Turn screw (4) clockwise.
reading.
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