The brush members extend through the slot with a first end of the brush arranged in the tube and {HEAD ~ a second end} contacting {TAIL ~ the workpiece} 
contacting
The brush members extend through the slot with a first end of the brush arranged in the tube and { HEAD ~ a second end } contacting { TAIL ~ the workpiece }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL