The pressing operation joins {HEAD ~ the probe shaft} to the specimen assembly form by {TAIL ~ plastic flow} of the coupon material between the former rod and the anvil of the press  
by
The pressing operation joins { HEAD ~ the probe shaft } to the specimen assembly form by { TAIL ~ plastic flow } of the coupon material between the former rod and the anvil of the press
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH