The yarn is fed through {TAIL ~ a hole} in the wall of {HEAD ~ the tube} from a groove on the outer surface 
The yarn is fed through { TAIL ~ a hole } in the wall of { HEAD ~ the tube } from a groove on the outer surface
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH