{HEAD ~ The height} of teeth of {TAIL ~ the toothed arch block} is approximately equal to the height of teeth on the ratchet wheel 
{ HEAD ~ The height } of teeth of { TAIL ~ the toothed arch block } is approximately equal to the height of teeth on the ratchet wheel
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH