The teeth project in {HEAD ~ the same direction} as {TAIL ~ the flange} of the helix to which they are attached 
as
The teeth project in { HEAD ~ the same direction } as { TAIL ~ the flange } of the helix to which they are attached
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH