A capacitor having at least one electrode pair being separated by a dielectric component, with the dielectric component being made of a polymer such as a norbornylene-containing polymer with a dielectric constant greater than 3 and a dissipation factor less than 0. In the invention, a so-called full-field sensor and an upper compression plate substantially equal in width with this sensor are used. The register block, which can be written by the master, includes two registers corresponding to the primary and secondary buses. The sprue apparatus may include an isolating coupler that substantially isolates a heated sprue bushing from carriage force. The cover shell may be bent towards the base shell, encasing the compact discs held in the disc shaped recess and of the shells and.