Parts of class II construction which serve as supplementary insulation or reinforced insulation, and which could be omitted during reassembly after servicing, shall be– fixed so that they cannot be removed without being seriously damaged,or– constructed so that they cannot be replaced in an incorrect position and if they are omitted, the appliance is rendered inoperable or manifestly incomplete.NOTE Servicing includes replacement of components such as supply cords except in appliances having a Type Z attachment and switches.Compliance is checked by inspection and by manual test.