I cleaned off the paint, and had a close look at the frame where the collars are attached. On my frame there is no visible weld at all on the rear collar, and only a slight tac weld on the front collar. Although I cant get the frame cleaned enough to see the ring from the brazing I am convinced it is furnace brazed.
There is no evidence of these being crimped in, and there are other locations on the tractor that were constructed this way, like the hub from the flywheel to the driveshaft. That hub is a flat sheet of steel brazed to the hub.
I cant say if IH changed process over the years, but the 3 frames I have spanning between 1968-73 are all the same.
Anyway, I took it to a metal smith who agreed that the beast approach was to oversize the hole, and turn a new pin, like bkw3614 suggested.
I should have it back by the weekend and i'll upload some images.
Mike
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