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