The release member releases {TAIL ~ a force} pulling the retractable unit when the retractable unit is moved to {HEAD ~ the closed position} 
The release member releases { TAIL ~ a force } pulling the retractable unit when the retractable unit is moved to { HEAD ~ the closed position }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD