Next, at the end of the backward stroke of {HEAD ~ the first ram}, the forming punch together with the pressure pad is lowered to form a bulge on {TAIL ~ a head portion} of the coupling element 
Next , at the end of the backward stroke of { HEAD ~ the first ram } , the forming punch together with the pressure pad is lowered to form a bulge on { TAIL ~ a head portion } of the coupling element
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH