{TAIL ~ Recess} 42 in {HEAD ~ turn} comprises channels 44 and open portion 46 
{ TAIL ~ Recess } 42 in { HEAD ~ turn } comprises channels 44 and open portion 46
TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH