The spring is mounted inside the recessed hole in the box end of the wrench and connected between the projecting rod of {HEAD ~ the toothed arch block} and inside wall of {TAIL ~ the recessed hole} 
The spring is mounted inside the recessed hole in the box end of the wrench and connected between the projecting rod of { HEAD ~ the toothed arch block } and inside wall of { TAIL ~ the recessed hole }
OTH OTH OTH 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 HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL