The counter shaft is attached at one end to a magnet wheel which communicates with {HEAD ~ a printed circuit board} to ensure {TAIL ~ accurate advancement} of the cover material 
to ensure
The counter shaft is attached at one end to a magnet wheel which communicates with { HEAD ~ a printed circuit board } to ensure { TAIL ~ accurate advancement } of the cover material
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH