The insert member fits within a sleeve member which is formed of {HEAD ~ a semiresilient material} capable of maintaining {TAIL ~ its shape} at rest but capable of being flexed when subjected to a force 
capable of maintaining
The insert member fits within a sleeve member which is formed of { HEAD ~ a semiresilient material } capable of maintaining { TAIL ~ its shape } at rest but capable of being flexed when subjected to a force
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH