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Locksmithing/Changing combination on a Cannon simplex pistol lock box


I hope you can help me. I have an old Cannon pistol box that is controlled with a simplex lock on the top of the lid. Two buttons need to be pushed simultaneously and one individually to turn the knob that opens the top of the box. I no longer have the instructions, but I do remember the combination. My question is, how do I change the combination? Thank you.

Hi Leonard,

While the pistol box may be made (or sold) by Cannon, the lock is made by Kaba America.   Simplex is one of the brands they have acquired over the years.
You can contact Cannon's customer support by calling  1-800-222-1055  to have them email you a set of instructions.

While Kaba makes a number of different lock versions, the combination changing sequence is basically the same, though you DO have to know the current code to change it.    If not then the lock WILL require full disassembly to reach the combination chamber, to manually reset the lock - this WILL require a trained locksmith who is familiar with these locks.

Basic instructions are:

With the container door locked OPEN!

1.   Turn the outside thumbturn to the left (counter clockwise) to the stop position; then release.   This will clear any random entries from the mechanism.

2.  Enter the existing combination

3.  Inside the container, on one end of the lock will be a "button", press it - you should feel a click.

4.  Turn the outside knob counter clockwise to the stop position, then release,

5.  Choose and enter your new combination.   Press the buttons carefully, and as noted you CAN press two buttons at the same time as part of the combination.
You can have from one to five buttons total but each button can be used ONLY once.

6.  Turn the outside thumbturn to the right (clockwise) to the stop position; then release.    The new combination should now be active if everything was done correctly.

Test your new combination several times to ensure the lock unlocks correctly, before closing and locking the container door.

If you make a mistake, try your old code to see if it still works.   If it doesn't and/or you don't understand these instructions, then you probably need to take the  box to a local locksmith to have them change it for you.


Hope this helps


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Terry V. Andreasen (Andy)


Safe and Vault related Questions; Antique Safe Repair and Restoration; With over 42 years in the Safe & Vault industry, if I can't answer your question I know where to get the answer. Current Project: Restoration of an Ely Norris Cannonball Safe from the early 1900's. Will answer Safe & Vault related questions concerning age, value, restoration, moving, opening & repairing, parts, operation and history. Note: It is not my intention to teach you to open safes or to provide information which may aid in the unlawful opening of a safe. I will not give out drill points or information which I deem inappropriate.


44 years in the Safe & Vault Industry. Owner and Service Manager for one of the largest Safe & Vault companies on the West Coast. Graduate of Lockmasters Safe Lock Servicing, Safe lock Manipulation and Safe Deposit Lock Courses. Graduate of Locksmith Institute. Certified Instructor for the California Locksmith Association teaching Basic and Advanced Lock Servicing, Basic Safe opening and Repairing. Factory Trained by AMSEC, LORD Safes, LeFebure, Mosler, KabaMas, LaGard and Sargent & Greenleaf Author of "The Coffee Table Guide to Antique Safes".

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Graduate of Locksmith Institute 1972 Graduate Lockmasters Safe Lock Servicing 1974 Graduate Lockmasters Safe Lock Manipulation 1975 Graduate Lockmasters Safe Deposit Lock Servicing 1985 Instructor Certified - California Locksmith Association - 1985 Factory trained by AMSEC, MAJOR, STAR, Johnson-Pacific, Kaba-MAS, Allied-Gary, ISM, Lord, Brown Safe, EXL, Mosler, Diebold.

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2009 - 2015 - Listed in AllExperts Top 50 Experts. All Expert Categories - Safes & Security Containers, Locksmithing, Antique Safes. Retired US Army Chief Warrant Officer (CW4), with 39 years of total service. With numerous awards from Vietnam, Desert Storm and Operation Iraqi Freedom. US Navy - 1971-1981 US Army Reserve 1984-2013 US Army Retired

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