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Common Problems With Composite Door Lock Replacement If you have a composite door you will likely find a multipoint locking mechanism. This is designed to prevent intrusions into your property. These locks require a certain amount of maintenance and care in order to function properly. In most cases, you will need to lubricate them or replace the central case/gearbox. Damaged or Worn Out Hinges When hinges are damaged or worn out, the door may be stuck or rub against the frame. This c