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