A method for authenticating user access by a user to an electronic device. In this way an easy adjustment andor exchange of parts of the filling-tube constructions can be provided by simply adjusting andor exchanging the second section, without disassembly of the connection between the first section and the mould-filling furnace. A string of characters are received. The first lead end can further include polymer fill within the interior space of the metal support and encapsulating at least a substantial portion of the metal support, the polymer fill defining at least some of the exterior surface of the first end between the exposed electrical elements of the first end. The flexure supports the head and is attached to a disk-facing surface of the rigid part.