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