The side of 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 {TAIL ~ a line} and straddling the central bore of the brush core, as seen in FIG 7 
arranged in
The side of 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 { TAIL ~ a line } and straddling the central bore of the brush core , as seen in FIG 7
OTH OTH OTH OTH OTH 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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH