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