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