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