Place On, Put On
You have a cross for a drunkard's car, to place on its dashboard. Drunkards should not drive, and when you put on a cross, it prevents the car from starting!
Imagine the power that starts emanating from the cross once it’s placed on the car, it can’t move even an inch. Nope, it's not going anywhere until its owner sobers up.
さい
の
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You have a lot of crosses to place on drunkard cars, so you get your cyborg (さい) to do it for you. The cyborg doesn't need sleep, so it can patrol the streets 24/7 for the sake of public safety. What a saintly cyborg.
Picture your cyborg, approaching a drunkard's car to place a cross on it. You see it open a big compartment on its chest, and it's filled with crosses.