apertures 70 and 72 can be located approximately 0 500 inches from the planes defined by the second surface 62 and the first surface 60 respectively the center of apertures 70 and 72 can be located approximately 0 500 inches away from the place defined by the third surface 64 apertures 70 and 72 can have a diameter of approximately 0 254 inches u2212 0 002 arc 74 can provide an approximately ninety degree transition between the fourth surface 66 and arc 76 at a radius of approximately 0 500 inches arc 76 can provide an approximately 180 degrees transition with a radius of 0 500 inches between arc 74 and fifth surface 80 the center of aperture 78 can be located approximately 1 550 u2212 0 004 inches from the plane defined by third surface 64 and approximately 2 600 inches away from the plane defined by second surface 62 aperture 78 can have a diameter of approximately 0 254 u2212 0 002 inches fifth surface 80 can be approximately 3 100 inches away from the plane defined by second surface 62 sixth surface 82 can be approximately 6 800 inches long and have teeth 84 extensions away from sixth surface 82 that extend approximately 0 190 inches from the flat part of sixth surface 82 the tip of the tooth 84 closest to fifth surface 80 being approximately 0 950 inches from the fifth surface 80 and the tip of the tooth 84 closest to seventh surface 86 being approximately 0 95 inches from the seventh surface 86 with approximately 0 700 inches of space between the tips of the teeth 84 the angle u00f8 of the teeth 84 can be approximately thirty degrees the transition between the fifth surface 80 and.