Abstract: A key-operated lock comprising a housing, a core and a set of pin stacks. The housing has a set of driver chambers and a set of inactive master-pin chambers. Each pin stack comprises pin stack elements, which include a driver and a tumbler. The driver is movably mounted in one of the driver chambers. The tumbler assembly is movably mounted in the core for radial movement relative to the bore in the body. Further, the tumbler assemblies including a plurality of releasably engaged parts movable relative to each other upon disengagement to change a dimension of the tumbler assemblies. Additionally, for at least one of the pin stacks, the pin stack elements further comprise one or more master pins.

Abstract: A key-operated lock comprising a housing, a core and a set of pin stacks. The housing has a set of driver chambers and a set of inactive master-pin chambers. Each pin stack comprises pin stack elements, which include a driver and a tumbler. The driver is movably mounted in one of the driver chambers. The tumbler assembly is movably mounted in the core for radial movement relative to the bore in the body. Further, the tumbler assemblies including a plurality of releasably engaged parts movable relative to each other upon disengagement to change a dimension of the tumbler assemblies. Additionally, for at least one of the pin stacks, the pin stack elements further comprise one or more master pins.

Abstract: A nut and bolt cover apparatus is preferably made from three pieces. A cover piece may be placed over a nut and may have an adapter piece placed over the cover. An exterior cover may be releasably attached to the adapter piece and may squeeze a portion of the adapter piece as the exterior cover is releasably attached to the adapter. Squeezing the adapter piece preferably compresses the cover piece and causes the cover piece to grip the nut of a nut and bolt assembly while the adapter piece grips the cover piece. Removing the exterior cover may relieve the compression forces causing the adapter piece to grip the cover piece and the cover piece to grip a nut, thus permitting the nut and bolt cover apparatus to be removed.

Abstract: A nut and bolt cover apparatus is preferably made from three pieces. A cover piece may be placed over a nut and may have an adapter piece placed over the cover. An exterior cover may be releasably attached to the adapter piece and may squeeze a portion of the adapter piece as the exterior cover is releasably attached to the adapter. Squeezing the adapter piece preferably compresses the cover piece and causes the cover piece to grip the nut of a nut and bolt assembly while the adapter piece grips the cover piece. Removing the exterior cover may relieve the compression forces causing the adapter piece to grip the cover piece and the cover piece to grip a nut, thus permitting the nut and bolt cover apparatus to be removed.