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I don't think that gadget does that. It certainly will allow you to override with an actual key. Anyway, the thing you are looking for is a gadget that secures your door absolutely from the inside so nobody can unlock it. That is not what a deadbolt does. Deadbolts are designed to do that and also let people with keys through - that is the entire point ...


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This image is of a commercial product that you can buy cheaply, but you can make something on your own that performs the same task if you want. Basically, you can wrap a strap around the thumb turn of the deadbolt and tie that strap to your door knob: Item on Amazon The strap has a big mechanical advantage over the small amount of torque a key can apply ...


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