Thereby, {HEAD ~ the internal ring} can deform over {TAIL ~ a range} of shocks but is prevented from deforming by the casing or metal ring above this shock range 
deform over
Thereby , { HEAD ~ the internal ring } can deform over { TAIL ~ a range } of shocks but is prevented from deforming by the casing or metal ring above this shock range
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH