How do I remove and replace the burner control knob?
To remove the knob, gently lift it straight up when the burner is in the OFF position. To replace it, position the control knob indicator line at the OFF position and press down firmly. A rubber grommet is located under each control knob and should be firmly attached around the cooktop opening.
From the official Bosch NGT/NGP Gas Cooktop manual, page 9
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