The present invention proposes a new method and apparatus for the enhancement of source coding systems. Power is delivered on demand via a sprocket driving a single freewheel attached to a modified left crank. A head restraint is operatively coupled to the seat back for pivotal movement between a use position and a stowed position. If a failure of a fiber channel over ethernet forwarder occurs, the program instructions execute to re-establish or redirect a connection over an alternate path through a redundant FCF without having to synchronize a connection state across all switches in the cluster. A whole or part of the core materials of at least one block are located circumferentially 180 degrees apart form the core materials constituting the other or another block.