{TAIL ~ Roller} 60 is movable along a surface 62 of {HEAD ~ the front section} 11b of the fixed frame 11 
{ TAIL ~ Roller } 60 is movable along a surface 62 of { HEAD ~ the front section } 11b of the fixed frame 11
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH