Upon entering this groove, the pushed anti slip off {HEAD ~ ring} is released from its expanded condition, decreasing in diameter so that it comes in contact with the inner circumferential surface of {TAIL ~ the pin insertion hole} of the link and with the inclined groove surface of the pin and, consequently, it is securely installed 
Upon entering this groove , the pushed anti slip off { HEAD ~ ring } is released from its expanded condition , decreasing in diameter so that it comes in contact with the inner circumferential surface of { TAIL ~ the pin insertion hole } of the link and with the inclined groove surface of the pin and , consequently , it is securely installed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH