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How-to-install-double-cylinder-door-lock, this was a really easy way to increase the security at my mom's house. these locks can be easily keyed to match your current locks, and installing them is a .... Double-cylinder deadbolts are recommended by law enforcement because they require that the deadbolt be locked or unlocked with a key from either side of the door and eliminate the interior turn ..., this is a tutorial on installing a double cylinder deadbolt with a two-inch backset for doors made by atrium, morgan and other companies. the particular lock used in this video is part #40510 ...