A small re-combinate lock for equipment and furniture such as desks and cabinets. The lock is comprised of a generally cylindrical shell and a removable plug rotatably mounted inside of the shell. The plug has a core and a plurality of multi-piece tumblers slideably mounted in the core. Each tumbler is an assembly comprised of a wafer holder and a combining wafer removably mounted at an end portion of the wafer holder. A wafer support ring is mounted on the core adjacent to one side of each tumbler and a rotatable wafer carrier is mounted on the core adjacent to the opposite side of the tumbler. The wafer support ring is keyed to the core and the wafer carrier is rotatable on the core. In each wafer carrier there are a plurality of coded wafers which can be exchanged with the combinating wafer of an adjacent tumbler. To re-combinate the lock, the plug is first removed from the shell with a master key. Thereafter, selected tumblers are re-combinated in accordance with a particular code by exchanging their respective combinating wafers with wafers of the adjacent wafer carriers. The re-combinating of a tumbler in the field requires three rotations of an adjacent wafer carrier, during which its combinating wafer is transferred from a wafer holder onto the adjacent wafer carrier and a substitute wafer is transferred from the carrier onto the tumbler's wafer holder.
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