{TAIL ~ Each roller gear} 86,87 comprises {HEAD ~ a rotating support plate} 90,89 respectively and two spaced rollers 92,91, respectively, rotatably mounted at diametrically opposite positions on the support plate 
{ TAIL ~ Each roller gear } 86,87 comprises { HEAD ~ a rotating support plate } 90,89 respectively and two spaced rollers 92,91 , respectively , rotatably mounted at diametrically opposite positions on the support plate
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH