{HEAD ~ The cambered end} 92 of the brush core includes {TAIL ~ a pair} of aligned slots 93, 94 which receive the keys 90, 91 of the cradle 85 
includes
{ HEAD ~ The cambered end } 92 of the brush core includes { TAIL ~ a pair } of aligned slots 93 , 94 which receive the keys 90 , 91 of the cradle 85
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH