I mounted the power lock on the inside of the door, and mounted the square tubing so it lined up with a hole I drilled in the door. I also drilled a hole in the door jamb of the car so the holes lined up. I used some 1/4 inch rod to connect the power lock to the square rod, and added a loop for a manual way to lock and unlock the doors. I powered it up, and it worked great! Now I need to build the one for the other door, and wire in the permanent power and lock switch.