I removed all the parts on the head of the device and removed srews. Then used knife to to separate the two parts of the device body starting from the charging connector continuing to the head of the device.
Once separated, i have used the cross screwdriver to remove the screw holding the printed circuit board.
Then i was able to see the a plastic rod going down from the head of the device which should push on the metal plate and press it against the second conductive plate. However, this did not happen because the second conductive plate was loose - did not stick to the plastic rod.
That's why I pressed the lower conductive plate against the rod and a bit deformed the metal so it is more near the other and heated the plastic rod behind it with a lighter and pressed the heated plastic against the conductive plate with a knife, thus fixing the conductive plate in the position ensuring good metal contact when the plastic rod is pressed.
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