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