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How to Replace a UPVC Door Lock If your uPVC lock is jamming, it may be the time to replace it. Other telltale signs include a loose handle or a lack of functionality. Making a change to a uPVC locking can appear difficult at first. But, it's simple to do. All you require are the right tools and skills. Take off the lock that was previously used. Although it's not a task for those with weak hearts, learning how to change the lock on your door made of pvc will save you money and increase your home's security