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Upvc Door Lock Replacements A lot of Upvc doors have a multipoint locking system that secures the door at various points with the turn of a key. This improves security and energy efficiency. Contact a locksmith if have issues with your Upvc locks. A professional locksmith will have the right tools and know-how to take the lock apart and clean the dirt that has accumulated and apply a lubricant to ensure smooth operation. Cylinder If it's a non-responsive door handle or an inability to lock the door, the