Features on {HEAD ~ the blade} cooperate with {TAIL ~ features} on the collection chamber to secure the blade to the collection chamber 
Features on { HEAD ~ the blade } cooperate with { TAIL ~ features } on the collection chamber to secure the blade to the collection chamber
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH