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Door Lock Replacement - What You Need to Know If the locks on your door start to begin to show signs of wear and tear, it's recommended to replace them. These signs can include things like difficulty turning the lock or finding a key that doesn't fit. Fortunately, putting in new hardware for your door is surprisingly easy. All you have to do is follow these steps. Deadbolt The deadbolt is your door's primary defense against forced entry. It is more durable and secure than the latch that operates the lock,