Q: I have a wooden entry door with a locking handle, but no deadbolt. I want to install one to make the door more secure. How do I do this? A: Having a door without a deadbolt is like mashed potatoes ...

Single-cylinder deadbolts (keyed on one side) will work fine for most situations. Double-cylinder deadbolts (keyed on two sides) are a good idea if you have a window near the deadbolt. For safety ...