{HEAD ~ The worm gear} in {TAIL ~ the second housing} has a central hub and to which is attached a support carrying the work head 
{ HEAD ~ The worm gear } in { TAIL ~ the second housing } has a central hub and to which is attached a support carrying the work head
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH