Located underneath inside escutcheon plate and held in place with a limiting plate and two screws 400 Series Frenchwood Hinged (In-Swing and Out-Swing) Patio Doors manufactured from 1988 to Present. If the deadbolt knob spins it is likely the actuator needs to be replaced. Used on Andersen Frenchwood hinged and outswing patio doors and 200 series inswing patio door. It is held in place with a limiting plate and two screws. This part activates the thumb turn lock. If the thumb turn spins it is likely this is the component needing to be replaced.