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Shaun and Jayden attended a property on Darkes Lane, Potters Bar EN6 after the homeowner reported that the front door lock had suddenly stopped working from inside the property. Interestingly, the lock continued to operate normally from the outside, making the fault appear more unusual than a typical lock failure.
Rather than assuming the cylinder had failed, Shaun and Jayden began by diagnosing the fault.
Based on the customer's description, their first suspicion was that the issue could be within the multipoint locking mechanism. To rule this out, they removed the cylinder from the door and tested it independently.
With the cylinder in their hand, the fault immediately became clear. Although the key continued to turn, the cam failed to rotate, confirming that the cylinder itself had failed. Because the fault remained outside of the door, Shaun and Jayden were able to completely rule out the gearbox and confidently identify the cylinder as the only failed component.
The existing cylinder was a brass British Standard 1★ anti-snap cylinder. Rather than simply replacing it, Shaun and Jayden discussed the available options with the homeowner, explaining the differences between a like-for-like 1★ replacement and upgrading to a 3★ high-security cylinder.
After considering both options, the homeowner chose to retain the existing level of security with a like-for-like brass 1★ cylinder, as it met their requirements and maintained the appearance of the door.
The new cylinder was professionally installed and, as with every ASJ Locksmiths job, the completed work was thoroughly tested before the homeowner was invited to operate the lock themselves to confirm everything was working correctly.
Why wasn't the gearbox replaced?
Because the cylinder was removed and tested independently, Shaun and Jayden were able to prove that the fault remained outside of the door. The key continued to spin while the cam failed to rotate, confirming the cylinder had failed and allowing the gearbox to be ruled out completely.
Practical Advice
If your lock suddenly behaves differently from one side of the door than the other, don't automatically assume the entire locking mechanism has failed. Different symptoms can point to different components. A careful diagnosis before replacing parts helps ensure only the failed component is replaced, often saving unnecessary expense.
By isolating the cylinder before recommending replacement, Shaun and Jayden accurately diagnosed the fault, ruled out the gearbox and allowed the homeowner to make an informed decision about the level of security they wanted for the replacement lock.
If you're experiencing problems with a lock or need a trusted locksmith in Potters Bar, ASJ Locksmiths provide honest advice, accurate diagnosis and professional locksmith services throughout Potters Bar and the surrounding areas.