The side of {TAIL ~ the cradle} 50 which receives the brush core is recessed in the center, and includes a pair of {HEAD ~ inwardly extending keys}, 90, 91, arranged in a line and straddling the central bore of the brush core, as seen in FIG 7 
The side of { TAIL ~ the cradle } 50 which receives the brush core is recessed in the center , and includes a pair of { HEAD ~ inwardly extending keys } , 90 , 91 , arranged in a line and straddling the central bore of the brush core , as seen in FIG 7
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH