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