Duerkopp Adler 743-221 Service Manual page 17

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Check the exact second needle position C with the locking pin.
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If the locking pin will not go into notch C of the adjusting disc,
correct the second needle position.
Adjustment
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Undo both clamping screws 7 on the position-sensor ring 8.
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Hold position-sensor ring 8 steady and rotate handwheel.
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Fully tighten clamping screws 7.
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Carry out sewing process.
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Check the second needle position with the locking pin.
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If necessary, correct the position of the position-sensor ring 8
again.
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