OK, much better understanding of this now, thank you all. I can't find any dimensional detail of the shaft online, but reasonably assuming the 3.5mm radius of the bearing part listed is a perfect match to the interior corner of the shaft, then yeah the bearing should touch at a single tangent point against that surface rather than be a snug fit. It's hard to visualize exactly how extreme the difference is, and I'm not opening that wheel up without parts handy so I think I'll look into buying the readily available and reasonably priced 29680 to better understand exactly how pronounced that radius is.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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