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Locksmithing/Removing old master deadbolt


I'm trying to replace a 70's Master single cylinder deadbolt in the house I bought.  When I remove the 2 screws from the inside (thumb turn) I could remove the outside keyed part.  There are no visible screws to remove the cylinder from the inside thumb turn part.  Any suggestion?

Hello Raj,

I would need a photo to help.  I don't recall what mounting method they used.

When you removed the screws on the thumbturn did the thumbturn come off?  Was there a plate under the thumbturn? The screws that held the thumbturn on, are those short, about 1/4" long?  If all of these answers are yes there are likely two other screws in the plate that remains.  Again a photo would be best.



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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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