This hinge will stop your windows self-closing and make it easier to open. Over time the pad may wear down making the opener too loose in operation. If this happens take a small bladed screwdriver and turn the screw by half a turn clockwise. The adjustment should be made equally to each pair of hinges. If this adjustment is insufficient then carry on turning the screw in half turn increments until the desired amount of friction is achieved. If the opener is very stiff in operation, turn the screw by a quarter turn increments anticlockwise until desired result is achieved.
NB: If you have difficulty in making the above adjustment, please contact your supplier for guidance.