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UPVC French Door Lock Replacement The process of changing the barrel on your uPVC door is a simple job that can be completed in less than five minutes. You might need to replace the barrel of your lock for a variety of reasons. The key might be lost or the houseshare is over and the locks are no longer required or they simply don't work as they should. Fixing a loose handle A door handle that isn't in good condition can be a nuisance, but it can also pose a security threat. It is usually a simple fix by