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Hello James, I need to replace a Harlock lockset from an exterior door. I can't see any visible screws on the inside, only a small round detent button on the outside round door knob. I did see a small slot on the inside door handle cover plate.  How do I remove this lockset and which brand of lockset will be easiest to replace it. I would like to utilize a smart key system so I can make all doors use the same key.

Hello Richard,

I'm not familiar with Harloc brand locks as they aren't used in my area.

The type of lock you have should use a retainer to hold the inside lever in place. There should be a small hole or slot somewhere on the inside lever. Press that retainer to remove the lever. Pry up the rosette (cover plate) and the mounting screws should be under that.

Almost every lock that uses a key has the mounting screws on the inside assembly for security so it's not likely that the mounting screws are on the outside assembly. That being said, if the first option doesn't work, insert a working key into the outside knob and turn it 45 degrees. Depress the small button as you pull the knob off. Pry up the rosette and the mounting screws could be under there.

If you are still unable to remove the lock let me know and I will research this further.

On the other note of the smart key system: STAY AWAY FROM SMART KEY LOCKS!!! Why?
1. They lack any type of security (search for smart key lock videos); and
2. They fail at random times; and
3. They don't last very long; and
4. You are better off buying a $5 lock than utilizing any lock with a smart key system (but I don't recommend a $5 lock).

To make all your doors use the same key, first determine which lock you want to keep. Find the key that fits it. Insert that key into all other locks you want to use the same key. Any lock that the key does not fit in to, replace. A Locksmith can tell you which brand of locks will work with the key you already use and while you don't necessarily have to buy locks from a Locksmith (highly recommended for a variety of reasons), you can buy the lock you need elsewhere then take it to a Locksmith to be rekeyed to match your other key.



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I do not answer Safe or automotive questions. Period. I am knowledgeable in almost every area of Locksmithing. This includes locks, keys, lost keys, residential and commercial lockouts, rekeying, masterkeying, high security locks, access control, electric locks, security cameras and home safety. I have been running an online business since 2004 where I sell all types of lock and security hardware to everyone from apartment renters to business owners to the US government. Before that I started a locksmith service in 1999. I deal with many types of security equipment including high security safe locks, heavy duty padlocks, exit devices, biometric readers, electric strikes, magnetic locks, full surface hinges and I only sell what I personally stand behind 100%. The online business has given me a more in-depth look at the locksmithing industry, helping me to learn more about each and every product that I offer, as well as products I don't have but end up finding for customers to solve any issues they have with security or door hardware.

Please don't submit any automotive or safe questions as these aren't areas that I can help in.


I have been Locksmithing since 1999 and own my own Locksmithing business. I have many years of hands-on experience through the many services I have performed for my customers. I've run my business the way I wanted, treating everyone as I would like to be treated and knowing that any customer could be my last if I didn't perform my locksmithing duties as I had promised.

I have a diploma in Masterkeying, Advanced Locksmithing & Locksmithing from Foley-Belsaw.

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