A sizing mandrel is to be used for calibration, which has {HEAD ~ a diameter} of 2 mm in {TAIL ~ the embodiment} shown 
A sizing mandrel is to be used for calibration , which has { HEAD ~ a diameter } of 2 mm in { TAIL ~ the embodiment } shown
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH