The present invention method and system ensure execution of post processing logic for a subject computer program routine without wrapping the routine inside another. The first joint member includes a coupling rod having a joint securing male threaded region and a centering pin. An adjustable stop is further provided for adjustably limiting the movement of the damper element to establish the second position of the damper. In preferred embodiments, the feed composition subsystem comprises at least one set of four or more feed-component flow restrictors, each of the four or more feed-component flow restrictors having a flow resistance that varies relative to other flow restrictors in the set.