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