In {HEAD ~ the preferred embodiment} of {TAIL ~ the invention}, the flat annular surface 34 at the tip distal end lies in a plane positioned at an angle of 15° to a plane normal or perpendicular to the center axis of the tip 
In { HEAD ~ the preferred embodiment } of { TAIL ~ the invention } , the flat annular surface 34 at the tip distal end lies in a plane positioned at an angle of 15 ° to a plane normal or perpendicular to the center axis of the tip
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