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How to Replace a UPVC Door Lock If your uPVC lock is jamming, it might be the time to replace it. Other signs to look out for include a sloppy handle or an inconsistency in performance. Making a change to a uPVC locking can appear difficult initially. However, it's simple to do. All you need are the right tools and the right expertise. Removing the old lock While it is not a task for the faint of heart Learning how to change the upvc door lock yourself will save you money and improve your home security.