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UPVC French Door Lock Replacement It takes just five minutes to change the barrel on your lock for uPVC doors. It is possible to replace the barrel of your lock for a variety of reasons. The key could be lost or the houseshare has ended and the locks are no longer required or they simply don't work as they ought to. Fixing a Loose Knob A door handle that isn't in good condition can be a nuisance however, it could also be a security risk. It's usually a simple fix to tighten the screws but it may be