Step 7More soldering
Free the brown and white wires from the plastic connector.
Strip 1/4" of the jacket from each of these wires.
Twist the brown wire together white the black wire from the piezo and white wire together with the red wire from the piezo.
Solder both pairs together.
Finally insulate them using electrical tape. I didn't have any electrical tape on hand, so I glued the two pairs together with hot glue in such a way that the metal contacts could never meet (see last image below).
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