Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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I don't know if the C230 has the same knob as my W220, but if there is a chrome collar at the bottom of the knob (closest to the console) you just turn that know a part turn clockwise (as you look down on the knob) and that unlocks the knob. It then just lifts off the shifter (doesn't unscrew). To reinstall it, you push the knob back down on the shifter and turn the collar anti-clockwise until it locks.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck