A mechanism (30; 230) for a lockset comprising: a latchbolt retractor (22; 222) that is rotationally actuatable; a plurality of adaptors (48, 52, 54; 248) that are each for a different lockset function; a plurality of user operated locks that are each for a different user operated lock function; and a rotationally mounted handle coupler (36; 236) configured for receiving any one of the plurality of user operated locks , the rotationally mounted handle coupler (36; 236) being rotatable by a rotation of a handle when coupled thereto and comprising an adaptor receiver (46; 246) for receiving any one of a plurality of adaptors (48, 52, 54; 248), wherein the adaptor receiver (46; 246) and at least one, but not all of the plurality of adaptors (48, 52, 54; 248) are configured to engage for transmission of the rotation of the handle to a latchbolt retractor actuator (32; 232), wherein received by the adaptor receiver (46; 246) is a selected one of the plurality of adaptors (48, 52, 54; 248) and received by the rotationally mounted handle coupler is a selected one of the plurality of user operated locks ; characterised in that the plurality of adaptors comprises a clutch adaptor (48; 248) operable to engage the adaptor receiver (46; 246) while being received thereby for transmission of the rotation and operable to disengage the adaptor receiver (46; 246) while being received thereby; and the adaptor receiver (46; 246) comprises a keyway , and the clutch adaptor (48; 248) comprises a retractable key (60; 260) and is operable to outwardly extend the retractable key (60; 260) into the keyway and to retract the retractable key (60; 260) from the keyway . a latchbolt retractor (22; 222) that is rotationally actuatable; a plurality of adaptors (48, 52, 54; 248) that are each for a different lockset function; a plurality of user operated locks that are each for a different user operated lock function; and a rotationally mounted handle coupler (36; 236) configured for receiving any one of the plurality of user operated locks , the rotationally mounted handle coupler (36; 236) being rotatable by a rotation of a handle when coupled thereto and comprising an adaptor receiver (46; 246) for receiving any one of a plurality of adaptors (48, 52, 54; 248), wherein the adaptor receiver (46; 246) and at least one, but not all of the plurality of adaptors (48, 52, 54; 248) are configured to engage for transmission of the rotation of the handle to a latchbolt retractor actuator (32; 232), wherein received by the adaptor receiver (46; 246) is a selected one of the plurality of adaptors (48, 52, 54; 248) and received by the rotationally mounted handle coupler is a selected one of the plurality of user operated locks ; characterised in that the plurality of adaptors comprises a clutch adaptor (48; 248) operable to engage the adaptor receiver (46; 246) while being received thereby for transmission of the rotation and operable to disengage the adaptor receiver (46; 246) while being received thereby; and the adaptor receiver (46; 246) comprises a keyway , and the clutch adaptor (48; 248) comprises a retractable key (60; 260) and is operable to outwardly extend the retractable key (60; 260) into the keyway and to retract the retractable key (60; 260) from the keyway . <EOS>