Note that the carriage can move past the support members 19 to a position at {HEAD ~ the left hand end} of {TAIL ~ the beam} 
of
Note that the carriage can move past the support members 19 to a position at { HEAD ~ the left hand end } of { TAIL ~ the beam }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL