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