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Upvc Door Locking Mechanism Replacement - DIY Or Call in a Professional? The lock on your upvc door is an essential piece of security for your home. It can be difficult to get into your home if the lock is damaged or is no longer working. Fortunately the replacement of a multipoint locking mechanism is a DIY task that is simple to complete. However, you should always make sure that you buy an alternative lock from the same manufacturer to ensure that it is compatible with. Fixing a stuck locking mechanism