FIG 1 shows a first limit switch 26 near the front end of the right hand spherical guide 8 and a second limit switch 27 near {HEAD ~ the rear end face} of {TAIL ~ the spherical guide} 
of
FIG 1 shows a first limit switch 26 near the front end of the right hand spherical guide 8 and a second limit switch 27 near { HEAD ~ the rear end face } of { TAIL ~ the spherical guide }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL