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Replacing a UPVC Door Lock Mechanism It isn't easy to replace uPVC lock mechanisms if you don't have the proper tools and know-how. Before you begin any work, it is essential to be aware of safety measures. All locks require regular cleaning and lubrication in order to ensure smooth operation. If you're experiencing an impossible-to-open uPVC door or the key is constantly turning inside the handle, it could be time for a replacement lock cylinder. Lock Cylinder A lock cylinder can be located on a u-shaped
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