However, in variations of {HEAD ~ the tip distal end surface} 34, the annular surface may be positioned at an angle to the normal plane ranging between 30° and {TAIL ~ 5°} 
However , in variations of { HEAD ~ the tip distal end surface } 34 , the annular surface may be positioned at an angle to the normal plane ranging between 30 ° and { TAIL ~ 5 ° }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL