Assuming a finite amount of friction, adhesion, and static electrical attraction between the fiber 11 and {HEAD ~ the wall} or wing 22, the fiber 11 could become jammed between {TAIL ~ the wing} 22 and the wall 
Assuming a finite amount of friction , adhesion , and static electrical attraction between the fiber 11 and { HEAD ~ the wall } or wing 22 , the fiber 11 could become jammed between { TAIL ~ the wing } 22 and the wall
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH