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UPVC French Door Lock Replacement It takes only five minutes to replace the lock barrel of your uPVC doors. It is possible to change the barrel on your lock for a number of reasons. The key could be lost or the houseshare is over and the locks are no longer needed or simply don't function as they ought to. Fixing a loose knob A loose door handle can be annoying however, it could also pose a security threat. It is usually a simple fix to tighten the screws but it can sometimes be more difficult if the