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