The shaping means is then moved proximally along a first predetermined contour, to a proximal area on the tube, and then along a second predetermined contour, symmetrical to {HEAD ~ the first predetermined contour}, back to {TAIL ~ the point} of entry 
The shaping means is then moved proximally along a first predetermined contour , to a proximal area on the tube , and then along a second predetermined contour , symmetrical to { HEAD ~ the first predetermined contour } , back to { TAIL ~ the point } of entry
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH