Thanks Jim - you are correct. The whole eccentric area is very different on the three bar.
On the three bar, there is a separate bushing with a groove that slides up and down in that U brakcet, and it also includes a tang that works sort of like the lift linkage on the 4 bar.
On the 4 bar - it appears there's no such bushing.
It's just the eccentric hub - a space - the U bracket - a large flat washer - then the sproket (washer and sprocket on the outside of the U bracket).
If you look at the picture of just the inner race of my eccentric (on the milk crate) you can see the previous owner welded something to the face fo the bearing hub on the eccentric.
Where the main shaft ran through the U bracket, it's WELL worn - like 1/4" deep groove all around it. I assume that weld job on the eccentric was some kind of attempt to protect the shaft - adding material that would ride against the U bracket instead of the shaft itself.
Since that welded area is mangled, and the U bracket isn't with the rake - we've had a lot of trouble just figuring out what's SUPPOSED to be there.
It was after inspecting the 3 bar that really got me thinking there HAS to be a part I'm missing.
But the more I dig - the more it seams there is nothing missing. (besides the U bracket).
If I can't find a good one, I'm considering cutting an inch or so out of the one on there now moving the two sides closer, and welding.
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