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Upvc Door Lock Replacements Many upvc door have multipoint locking systems that secure the door at various points with the turn of the key. This improves security and energy efficiency. Contact a locksmith if you have issues with your Upvc locks. A professional locksmith will have the equipment and knowledge required to take the lock apart and wash off any dirt that's accumulated. They'll also apply lubricant for smooth operation. Cylinder Whether it's an unresponsive door handle or inability to lock the