The invention provides a protection device for protecting a flat cable in an optical disk drive. The trigger blocking device holds a blocking shaft behind the trigger, the shaft being capable of sliding longitudinally or axially into two separate positions, one position where the shaft blocks the operation of the trigger and the other position where a recessed area in the shaft forms a trigger channel, when moved into position, allows the operation of the trigger. Still another aspect of the present invention employs an electronic control unit and one or more sensors to determine a riveting characteristic andor an actuator characteristic. The first and second pair of arms, with a reduced thickness, impart to the coupling yielding for rotations around the first and second axes of the central region. In summer the spots on the older leaves lighten to cream and pink.