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Upvc Door Lock Replacements A lot of Upvc doors come with multipoint locking systems which secure the door at several points by turning the key. This improves security and energy efficiency. Contact a locksmith if have issues with your Upvc locks. A professional locksmith has the tools and experience necessary to disassemble the lock and wash off any dirt that's accumulated. They will also apply lubricant for smooth operation. Cylinder It doesn't matter if it's a sluggish door handle or inability to lock