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