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UPVC Door Lock Replacement UPVC doors are an effective protection against burglaries. However they do have some limitations that can be addressed by installing a deadlock. If your uPVC front door lock is loose or floppy, it may be time to change the lock's barrel. This simple DIY project can improve the security of your home as well as improve its appearance. Removing the old lock cylinder You may have a damaged lock-cylinder when you notice that your front door is flimsy or the key struggles to turn. Re