Alternatively, such struts may constitute {HEAD ~ shutters} joining to the tube body by resilient hinges and pivotable about such hinges between {TAIL ~ such radially inner and outer positions} 
Alternatively , such struts may constitute { HEAD ~ shutters } joining to the tube body by resilient hinges and pivotable about such hinges between { TAIL ~ such radially inner and outer positions }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL