Duerkopp Adler 550-16-23 Operating Instructions Manual page 9

4.5 Winding the Hook Thread
3 2
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Slip the bobbin onto the bobbin winder 2.
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Pull the thread through the guide 3 and the tension 4.
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Wind the thread clockwise about 5 times around the bobbin core
and tear off at the thread clamp.
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Swing the bobbin winder lever 1 towards the bobbin .
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Sewing
The bobbin winder lever will stop the winding process as soon as
the bobbin is full.
ATTENTION !
If the thread is not to be wound during sewing,
it is essential to arrest the sewing foot in the raised position.
(See chapter 4.10)
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