Pfaff 1540 - Manual (Page 68)

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35. Adjustment of bobbin winder stop
Requirement:
The bobbin winder must stop when the thread has reached a level of 1 mm below the bobbin rim.
Check:
z Wind a bobbin and check that the winder stops as required.
Adjustment:
z Loosen screw 123 (fig. 72).
z Position stop 124 to the left for less thread and to right for more thread.
z Tighten screw 123.
Cross-check:
z Wind a bobbin and check that the winder stops as required.