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