Electrolux W585S Service Manual page 49

Gently push the screwdriver inwards and turn the control knob counter-clockwise until the screwdriver goes further in.
Continue turning a quarter of a turn until it is possible to remove the control knob.
Cover ring
When the control knob is removed, insert the screwdriver in the lower hole and press gently. Turn the cover ring
counter-clockwise until it is possible to remove the cover ring.
Mount the new cover ring and rotate it clockwise until it is in position.
Service Manual
49
fig.7492
fig.7493
fig.7490