The mechanism is purely mechanical and operated by springs, and is thus not subject to any of {HEAD ~ the problems} encountered by {TAIL ~ electronic or pyrotechnically actuated separation devices} 
encountered by
The mechanism is purely mechanical and operated by springs , and is thus not subject to any of { HEAD ~ the problems } encountered by { TAIL ~ electronic or pyrotechnically actuated separation devices }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL