Alternatively, the practitioner or assistant may grasp {HEAD ~ the coil} between a thumb and fingers to feel for the palpable ridges as {TAIL ~ the coil} is withdrawn from the endoscope or feel for vibration of the coil as the textured portion exits the endoscope 
Alternatively , the practitioner or assistant may grasp { HEAD ~ the coil } between a thumb and fingers to feel for the palpable ridges as { TAIL ~ the coil } is withdrawn from the endoscope or feel for vibration of the coil as the textured portion exits the endoscope
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH