The apparatus may further include one or more sources of a sanitizing agent configured to direct the sanitizing agent toward {HEAD ~ the point} of {TAIL ~ contact surface} 
of
The apparatus may further include one or more sources of a sanitizing agent configured to direct the sanitizing agent toward { HEAD ~ the point } of { TAIL ~ contact surface }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL