The brush members are adjustably arranged in {HEAD ~ a housing} such that {TAIL ~ the angle} of the brush member relative to the workpiece can be varied 
The brush members are adjustably arranged in { HEAD ~ a housing } such that { TAIL ~ the angle } of the brush member relative to the workpiece can be varied
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH