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