The actuator itself is not grounded by it's body, bracket or rivets. It gets grounded threw the switch, and the ground will change between the blue and black wire that hook to the actuator depending on the switch position. Unlock = (black+)( blue-).....lock= (blue+) (black-). The two switches just change the polarity of the wires and which ever is the negitive is the one that gets feed to the ground wire on the drivers door. An actuator is just a fancy word for a motor that works in both direction.
What are window blocks? Sorry, didn"t mean to change the subject. Just wanted to know if I had them, or if I needed them.