Each worm gear selectively moves a rack which is an engagement with {HEAD ~ a postage print wheel} so as to provide {TAIL ~ rotational movement} to the print wheel 
to provide
Each worm gear selectively moves a rack which is an engagement with { HEAD ~ a postage print wheel } so as to provide { TAIL ~ rotational movement } to the print wheel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH