center but r 1 lt r 2 in the illustrated embodiment of fig3 the journal surface 18 and or 22 comprises a u201c pressure side u201d or direct contact surface adjacent span 51 b formed at a first radius 61 a u201c non pressure side u201d or non contact surface adjacent areas 51 a c d is formed at a second radius 63 that is shorter than the first radius 61 the cylindrical cavity 27 defines a maximum potential contact area having an angular span of approximately 180 u00b0 as shown in fig3 in one embodiment the direct contact surface 51 b spans an angle 65 of at least 130 u00b0 of said maximum potential contact area the radial center 67 of the bearing pin 17 may be eccentric to a radial center 69 of the cone 23 and the radial center of radius 61 this offset may comprise approximately the value of the radial bearing clearance alternatively the bearing pin may be formed at two or more radii that originate from the same radial center in still another alternative only a portion 51 b of the journal surface 18 22 may be formed at the radius 61 that matches the radius of the cylindrical cavity 27 in alternate embodiments e g fig7 10 the second radius may be equal to or greater than first radius 61 for example fig7 depicts an embodiment wherein the pressure and non pressure sides of the pin have equal radii 75 77 e g 0 990 inches that originate from different centers 79 81 respectively fig8 illustrates an.