Master Lock Master Keys

[stratmando]

I have an old Master Lock Code book, shows some Master keys, seems locks would have been sold in sets somehow, as they are riveted or did Master Lock make some cylinders that could be pinned/repinned. The book is probably over 30 years old, will have to dig out for exact year. Never pulled apart a Master lock that had more than the 2 pins?

[cledry]

I have an old Master Lock Code book, shows some Master keys, seems locks would have been sold in sets somehow, as they are riveted or did Master Lock make some cylinders that could be pinned/repinned. The book is probably over 30 years old, will have to dig out for exact year. Never pulled apart a Master lock that had more than the 2 pins?

Master has rekeyable versions of many of their locks.

[stratmando]

I believe it had between 10? and 25? "Master Keys"codes, not a whole lot. Thousand(s) of regular(non master keys codes), After I calibrate my Blitz, may make the "Masters", sure they will never be used.