a means for adjusting {TAIL ~ tension} of said linear means, said means for adjusting {HEAD ~ tension} being located on said mounting assembly, 
a means for adjusting { TAIL ~ tension } of said linear means , said means for adjusting { HEAD ~ tension } being located on said mounting assembly ,
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH