Thereafter, a quantity of {HEAD ~ primer material} is positioned within the tubing through the second, open end thereof and deposited on an internal bottom surface of {TAIL ~ the tubing} 
Thereafter , a quantity of { HEAD ~ primer material } is positioned within the tubing through the second , open end thereof and deposited on an internal bottom surface of { TAIL ~ the tubing }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL