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