In further embodiments, {HEAD ~ a restrainer} can be provided to limit and control {TAIL ~ the movement} of the spring arms 
provided to limit
In further embodiments , { HEAD ~ a restrainer } can be provided to limit and control { TAIL ~ the movement } of the spring arms
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH