An electromechanical cylinder lock-key-combination includes a key having a mechanical locking code and a device for storing an electronic code and sending it into the lock. An aperture in the skull andor a channel device implantable in the skull can be used to facilitate direction and focusing. The torque biasing system has a clutch pack and an actuator that regulates engagement of the clutch pack. A separator wheel is disposed on the shaft for rotation therewith.