Undent the top screen from the inside of the head basket by tapping a wooden cooking spoon or other rounded wood implement with a mallet, until the basket's original shape is back. Nothing more to it.
You get access to the inside of the head basket by:
* unscrewing three Phillips head screws that attach the capsule head to the mic body
* turning the head upside down, unscrewing three small slot screws which hold the capsule assembly plate to the head basket
* keeping the head upside down, carefully lift up the capsule assembly from the basket with smooth cheek pliers gripping
one of he two contact blades
* reassemble in reverse