If the doors in your home are hollow and you have kids, chances are you've had to, or will have to, repair a hole in a door. Simply cut out the damaged area in the shape of a square. A razor knife and small rat-tail saw will work nicely. Next, cut a piece of backer board from quarter-inch plywood that is a couple of inches larger than the opening -- in both directions. You'll need to cut the backer board in half to get it into the hole. Apply a bead of glue to the face of the backer board and place it against the inside face of the door. Use a few drywall screws to secure the material. Once the glue has dried, remove the screws and cut a piece of eighth-inch plywood to fit over the backer board flush with the door. Glue the patch into place, putty, sand and paint. And that's the On The House tip for today.