The "float" of either the carrier or base for the graphite bearing is a factor. There is a lot of intentional imprecision designed into the way they fit into the fork -- allowing the faces to align with the plane made by the tops of the fingers in the instant before the real pressure comes on. There is enough slop there that either should align okay if in good condition. Trick is (at least in the A/B/C) that there's a cotter pin in the middle of the tapered dowel that the fork hinges on. Positioned such as to prevent the dowel from sliding out too far either side of the torque tube casting, it still allows the carrier to slide back and forth .
I'm not really sold on the axial vs. thrust bearing idea. Thrust-type steel throwout bearings were hardly a new concept by the late 40's. While history may lead us to doubt the business acumen of IH's management, their engineers were first rate. They'd have specced the proper type of bearing.
As for wear in the graphite vs. steel, I come out in favor of less wear on the steel. Within the range that either will float, the gyroscopic effect (I know, there's another, proper, name for it, but it escapes me) of the center of the bearing turning will cause it to center itself up as it picks up speed -- it will shift as much as the carrier allows to center and spin-balance itself. And if it is off center, the fingers of the clutch are not as apt to rip or chip away at the steel face as they would on a graphite face.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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