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