In the preferred embodiment, the oblique angle formed by {HEAD ~ these end surfaces} is 15° from a plane positioned normal or perpendicular to {TAIL ~ these axes} 
In the preferred embodiment , the oblique angle formed by { HEAD ~ these end surfaces } is 15 ° from a plane positioned normal or perpendicular to { TAIL ~ these axes }
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 TAIL TAIL TAIL TAIL TAIL TAIL