In a preferred form of the invention, the system includes {HEAD ~ a means} for adjusting the tension of {TAIL ~ the cable} 
In a preferred form of the invention , the system includes { HEAD ~ a means } for adjusting the tension of { TAIL ~ the cable }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL