an extended shafts position placing the guide device into the rigid state, in which position {HEAD ~ the opposing shafts} are extended to {TAIL ~ 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 order to guide the axle ; and 
are extended to
an extended shafts position placing the guide device into the rigid state , in which position { HEAD ~ the opposing shafts } are extended to { TAIL ~ 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 order to guide the axle ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL 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