In this annular space section, {HEAD ~ the pin} is provided with {TAIL ~ a groove} which is tapered such that the diameter of the pin increases towards its open side 
In this annular space section , { HEAD ~ the pin } is provided with { TAIL ~ a groove } which is tapered such that the diameter of the pin increases towards its open side
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH