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