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