Door Handle Repair

Most household door handles use a simple mechanism with a screw-style axle (called a spindle) that has at least one flat side, which is passed through the door jigger, leaving some length exposed on each side of the door to which the handles are attached. Some handles are attached on both sides by screwing or sliding them directly onto the spindle, and then securing one or more retaining screws (set screws) through the knob perpendicular to the flat of the spindle.

Handles that lose traction can frequently be repaired by replacing or adjusting the set screw, which prevents them from slipping on the spindle. Other types of handles, typically used in Europe, slide onto the spindle but are affixed only to the door itself without the use of set screws.

 Possible causes for a doorknob or handle to break:

• The screws have become stripped over time. Stripped screws are not able to hold a knob or handle in place as stripped screws cause the loosening of the handle.
• The parts of the knob or handle are old or have not been maintained properly. Old knobs and handles loosen as a result of built-up dirt and grime within the locking mechanism. The lock mechanism may not work simply because the lock is dirty or dry and needs to be lubricated with graphite (do not use any type of oil because this will gum-up the works). An improperly functioning latch may be the result of a poorly fitting door.
• Missing screws is one of the main reasons that knobs and handles become loose. Knobs and handles require that all screws are present and working in order to stay secure and tight.

• Door Knob Replacement
• How to Rekey a Lock
• Door Handle Wiki