an extended shafts position placing the guide device into the rigid state, in which position the opposing shafts are extended to a maximum and block the connecting interface so as to form a rigid connecting interface between the axle and the guide arm allowing orientation of the axle in {HEAD ~ order} to guide {TAIL ~ the axle} ; and 
to guide
an extended shafts position placing the guide device into the rigid state , in which position the opposing shafts are extended to a maximum and block the connecting interface so as to form a rigid connecting interface between the axle and the guide arm allowing orientation of the axle in { HEAD ~ order } to guide { TAIL ~ the axle } ; and
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH