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Upvc Door Lock Replacements Many doors made of upvc have multipoint locking systems which secure the door at various points with a turn of the key. This increases security and energy efficiency. Contact a locksmith if have problems with your upvc locks. has the tools and experience necessary to disassemble the lock and clean any dirt that has built up. They can also apply lubricant for smooth operation. Cylinder If it's a non-responsive door handle or inability to lock the door, these problems can be a ma