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