The lower cutter blade 108 is affixed to a drive wheel 106 having {HEAD ~ a drive tire} 104 on {TAIL ~ the periphery} of wheel 106 
The lower cutter blade 108 is affixed to a drive wheel 106 having { HEAD ~ a drive tire } 104 on { TAIL ~ the periphery } of wheel 106
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH