More in Windows Walls and Doors
Check the center shim and the gap to make sure the door is plumb. Nail the door in place, from the jambs through the shims.
Use a nail set to set the nails beneath the wood, creating a smooth finish. Fill the holes with spackle.
Place a level on the vertical surface to check that the door is plumb (Image 1).
If you need to adjust the door, try using a sledgehammer with a very gentle tap (Image 2).
Excerpted from Do It Yourself Home Improvement
© Dorling Kindersley Limited 2009