{HEAD ~ The ratchet wheel} has an annular groove around the periphery, and {TAIL ~ a plurality} of teeth equiangularly spaced around the annular groove 
{ HEAD ~ The ratchet wheel } has an annular groove around the periphery , and { TAIL ~ a plurality } of teeth equiangularly spaced around the annular groove
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH