The spring 13 has one end mounted in the blind hole 102, and an opposite end connected to {HEAD ~ one end} of {TAIL ~ the toothed arch block} 12 
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The spring 13 has one end mounted in the blind hole 102 , and an opposite end connected to { HEAD ~ one end } of { TAIL ~ the toothed arch block } 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH