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