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