On Cougar the door and pass through key are the same style but are keyed differently. My thought would be to either use your spare pass though key or see if your local hardware store has a blank, then buy it, stick it in the deadbolt lock and break it off. Then the lock will only be able to be operated from the inside.
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Bill
2015 Ram 1500 Ecodiesel
2015 Cougar 26RBI
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