The hardest part of the installation is drilling a straight hole straight into the door. Go to a hardware store and buy a hole saw to make the installation easier. The resulting cylinder must be parallel/straight so that the end product fits snugly against the door. There isn't much room for error. The picture is very clear. You have to wrap your head around the image, which is the inverted image, but that's enough to tell if someone's there from a few feet away.
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