In some embodiments, the invention comprises {HEAD ~ upper and lower output rollers} fixedly mounted in {TAIL ~ relation} to the front stop mechanism and translatable therewith 
In some embodiments , the invention comprises { HEAD ~ upper and lower output rollers } fixedly mounted in { TAIL ~ relation } to the front stop mechanism and translatable therewith
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH