The method 4 wherein said step of adjusting includes the step of changing {HEAD ~ the distance} between {TAIL ~ said spaced points} 
The method 4 wherein said step of adjusting includes the step of changing { HEAD ~ the distance } between { TAIL ~ said spaced points }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL