{HEAD ~ The spring} is biased to require {TAIL ~ sufficient force} to insert or remove the ferrule 
is biased to require
{ HEAD ~ The spring } is biased to require { TAIL ~ sufficient force } to insert or remove the ferrule
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH