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How to Replace a Replacement Upvc Door Lock Mechanism A new upvc lock mechanism is a great option for increasing the security of your home. It is essential to know the kind of uPVC door lock you are using to find an alternative. Sticking uPVC mechanisms could be caused by broken hinges inside the lock or excessive pressure. The easiest solution is to lubricate the hinges. Identifying the manufacturer The first step to replacing your uPVC lock mechanism is to identify its manufacturer. This can be done by