{TAIL ~ A ring} is rotatably mounted to the cylindrical top and has {HEAD ~ a concaved area} for allowing at least one of the two pawls to be extended outward 
{ TAIL ~ A ring } is rotatably mounted to the cylindrical top and has { HEAD ~ a concaved area } for allowing at least one of the two pawls to be extended outward
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH