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Replacing a UPVC Door Lock Mechanism Replacing uPVC door locks can be difficult when you don't have the appropriate tools or experience. Before starting any work, it's crucial to be aware of safety measures. All locks require regular cleaning and lubrication in order to function smoothly. If you own a uPVC lock that is difficult to open or the key is turning inside the handle, it may be time to replace the cylinder of your lock. Lock Cylinder A lock cylinder can be found on a upvc u-shaped door. It all
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