The guide arm has {HEAD ~ a mount} for fitting {TAIL ~ said machine tool} and said housing has at least one top track wheel, at least one side track wheel and at least one oblique track wheel adapted for rolling along the top, side and edge of the elongate track, respectively 
for fitting
The guide arm has { HEAD ~ a mount } for fitting { TAIL ~ said machine tool } and said housing has at least one top track wheel , at least one side track wheel and at least one oblique track wheel adapted for rolling along the top , side and edge of the elongate track , respectively
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH