Small white knob in trunk

Sorry to be so stupid, their is a small white knob on the left side in the trunk, behind a flap. Its a 1991 190E 2.6. Just wondering what part it plays. Thanks in advance, Ken

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Don't touch it! It fine tunes the flux capacitor.
No, not really...... it is the adjustment knob for the sun roof. No need to play with it unless you replace the lifting bridges etc.

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