One or more piezoelectric ring bender actuators may provide {HEAD ~ the force} required for compressing {TAIL ~ the support ring} and deflecting the optical surfaces 
required for compressing
One or more piezoelectric ring bender actuators may provide { HEAD ~ the force } required for compressing { TAIL ~ the support ring } and deflecting the optical surfaces
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH