First we remove the hinge pin. Place the screwdriver under the lip of the top pin head and lightly tap it upwards. If the head of the pin is flush against the hinge, a chisel or putty knife might be needed to expose the lip. Alternatively, the bottom pin head is usually easy to remove and the screw driver can be inserted into the hinge and the pin can then be tapped upwards. Whatever method works, be sure to be careful not to mar the hinge with the screwdriver.