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