Guard tumbler
Guard tumbler: a special type of lever tumbler used in safe deposit locks to prevent opening without use of a guard key with matching combination. In single horn safe deposit locks there are usually two guard tumblers mounted on the same curb post as the other tumblers. In double horn safe deposit locks there are usually five or six guard tumblers mounted on a separate curb post with key access through the second horn. The guard tumbler is also called the preparatory tumbler. See also trap tumbler, combination tumbler.
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