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