As far as I know that TM isn’t publicly available. I rebuilt one into an operable unit that was once demilled, with about a 3/4” torch gash cut thru it and missing 2 roller bearings. It was also made oval due to the handling and being thrown around at the scrap yard. I got it at $50 scrap price so even if it was used as a static display it would have been ok with me. I was able to weld and make filler pieces with some steel I had. And a lot of grinding. It helped to have another uncut unit to compare it to.
But there is 3 pieces to the ring. The inner, outer (part that has the attachment points to the truck), and an inner race. If you remove from the truck and flip it over, remove the screws, the felt pad, and you’ll see the rollers and brass races. Take it all apart and clean it out, I used regular grease and it is out in the weather for 5 years on the truck and it still turns smoothly. It’s actually really simple inside it. Hardest part is taking it off the truck. If you have a bad roller, or missing one, I believe it is 5/8 round bar with beveled ends. It’s been a while.
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