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Pick-Proof Your Dead Bolt
Even amateur thieves can pick a lock. To hold the dead bolt firmly in place so the door can't open, install the SIMLock (thesimlock.com). Replace a dead bolt screw with SIMLock's special screw, then slide the 'lock' over it to keep the dead bolt from turning. This product only works on dead bolts that lock in the vertical position.
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Reinforce Your Entry Door Strike Plate
Reinforcing your door's weak spot, the jamb, with a heavy-duty strike plate and extra-long screws gives it the added strength needed to withstand a burglar trying to kick in your door. If your dead bolt was installed within the last 10 years, it's probably already reinforced. To check, simply remove the strike plate. If it's heavy steel with at least 3-in. screws or has a heavy reinforcing plate, you can rest easy. If not, buy strike plate-reinforcing hardware.
To install, remove the old strike plate, then hold the new one in place and deeply score around it. Chisel out space for the new plate, then mount it by driving 3-in. screws through predrilled holes.