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