The plate around the timer knob is attached together with clips.

To remove the plate from the coffee grinder, put a flathead screwdriver between the connections and use force to lever it out.

Next, unscrew the two screws connecting the timer circuit board to the plate with a Phillips screwdriver.

Use pliers and pull the grind control knob apart from the timer knob, as it is connected with clips.

Remove the plastic ring insert which is attached via a pin and a spring, by pulling it apart.

Remove the knob lid with pliers, then extract the spring inside the timer knob.