{HEAD ~ a front stop mechanism} disposed downstream from {TAIL ~ the input section} and mounted to the front stop support plate, wherein translation of the front stop support plate along a general direction of the material flow path varies a distance between the front stop mechanism and the input section; and 
disposed downstream from
{ HEAD ~ a front stop mechanism } disposed downstream from { TAIL ~ the input section } and mounted to the front stop support plate , wherein translation of the front stop support plate along a general direction of the material flow path varies a distance between the front stop mechanism and the input section ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH