A method is provided for manufacturing a magneto-resistive device. For a strapping device with high functional reliability and ease of handling, despite the possibility of automated production of wrapped straps, at least to a large extent, the strapping device to includes a planetary gear system for transferring and changing the rotational speed of a drive motion provided by an electrical drive of the friction welder. The elongated tuft and the complementary tuft have angled profiles angled to a different degree, and preferably also in a different direction. The materials can vary and each damascene layer nay be either a single damascene or a dual damascene layer. A cost function may be generated and values for one or more unknown variables may be computed by reducing the cost function with respect to the one or more unknown variables. A method for linearly compliant audio speaker damping and a method for application of voice coil conductors on the damper.