An electro-mechanical lock is provided for a door. The lock includes inner and outer lock components mounted on opposite sides of the door and a tube extending between the inner and outer lock components, the tube being configured to receive a spindle extending through the door. The tube includes an electrical conductor integrated with the tube as a one-piece construction for transmitting electrical power and/or control signals between first and second electrical connectors at the inner and outer lock components. The tube is less fragile than conventional double tube arrangements in locks and thus can be more easily cut to length and installed at the door, improving reliability and cost effectiveness of methods of installation.