An upper bladeguard is immovably secured to the housing and has {HEAD ~ a rear wall} defining {TAIL ~ an arcuate slot} 
An upper bladeguard is immovably secured to the housing and has { HEAD ~ a rear wall } defining { TAIL ~ an arcuate slot }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL