With regards to changeable locks, though the overall mechanism is all lever tumblers, the changeable half is completely different. There are two major designs: changeable levers and changeable fence. Steve Young has an in-depht article on safe deposit lock servicing which reveals how they appear to be. Changeable lever design is generally seen on early locks, similar to LeFebure series. These locks are non-handed resulting from their changeable lever mechanism and double changeable. Changeable fence design continues to be broadly used to this day and is usually seen on high safety changeable key locks too. The changeable fence can be applied on both renter or guard lock or each locks, so we are able to have one fixed and one changeable lock and double changeable lock to completely serving our needs. We don’t need to dig into how and why each mechanism works in detail, the whole idea of the right way to reset to new keys is mostly the same.
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