How to repair the latch mechanism of a doorknob
Turning a door knob pulls the end of a deadbolt or latch out of an opening in a strike plate on the front of the jamb, allowing the door to open. If the door knob and strike plate are not damaged and the knob does not operate as it should, there may be a problem with the latch mechanism. Repairing the more complex mortise locks found on many entry doors requires training and experience. However, a DIYer can usually troubleshoot and repair a door knob's latch mechanism in a short amount of time. Open the door so you can reach the knobs on both sides. Place a door stop under the door. Examine the opening in the metal strike plate at the front of the door jamb. If you notice worn areas around the edges of the opening, hire a door installer or contractor to adjust the door hinges and align the door. Alternatively, proceed with the door knob. Using a suitable screwdriver, loosen and remove the machine screws securing the door knob to the inside of the door. Save the screws and pull off both knobs. If the screw heads are not exposed, use a small screwdriver to push in a tab on the knob's shaft. Pull off the doorknob. Push down on the spring clip holding the round base plate to the front of the door and remove the plate to access the screws. Loosen and remove the two screws securing the front plate of the latch assembly to the edge of the door. Pull the assembly out. Push down on the spring-loaded latch assembly by hand and release. If it is difficult to push or does not spring back, place it on a rag with the latch facing up. Spray some lubricant in the small gap between the outer edges of the latch and the hole where it springs back. Press down and release the latch several times. If it moves freely, reinstall the latch and doorknob in the reverse order in which they were removed. If the latch continues to stick, tap the assembly several times on a firm surface and spray more lubricant into the gap.
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