The closure mechanism corresponds to {TAIL ~ the retractable/deployable bolster} and allows {HEAD ~ the retractable/deployable bolster} to be deployed or retracted 
The closure mechanism corresponds to { TAIL ~ the retractable / deployable bolster } and allows { HEAD ~ the retractable / deployable bolster } to be deployed or retracted
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH