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Upvc Door Lock Replacements Many doors made of upvc have a multipoint locking systems that secure the door at various points by turning the key. This improves security and energy efficiency. Call a locksmith if you have problems with your upvc locks. A professional will have the proper tools and experience to disassemble the lock and clean the dirt that has accumulated and apply lubricant to ensure smooth operation. Cylinder Whether it's an unresponsive door handle or the inability to lock the door, these