A sleeve is located within the housing to provide {HEAD ~ support} to {TAIL ~ the worm gears} and maintain alignment of the racks during printing 
to
A sleeve is located within the housing to provide { HEAD ~ support } to { TAIL ~ the worm gears } and maintain alignment of the racks during printing
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH