{TAIL ~ The opposite end} of {HEAD ~ the toothed arch block} 12 is biased by the smoothly arched notch 101 by the spring 13 
{ TAIL ~ The opposite end } of { HEAD ~ the toothed arch block } 12 is biased by the smoothly arched notch 101 by the spring 13
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH