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How to Replace a Lock on a UPVC Door in Five Minutes The lock you put on your door made of upvc an easy and cost-effective project that can be completed in only five minutes. This is a great way to improve the security of your home, whether you're replacing a lock in the aftermath of an attack, or just need to increase security. 1. Remove the old lock The first step to change the lock on doors made of upvc is to remove the lock that was previously in use. It may seem difficult at first, however with som