Pics of the homebrew adjustment:
Spring compressors in place, suspension jacked but backed off, so it is relatively de-stressed.
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Overall view of the winch / come-along used to gently pull the left and right sides together. Very little force was actually needed here to get things to move. This just allowed me to get it moved securely and easily, working alone, taking it slow and careful.
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Close up of right side attachment. The C-clamp is not tightened. It is just a convenient interface to get the hook on the winch to pull on the lower shock mount.
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Same thing on left side.
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Right side camber adjustment bolt, rear view, where the eccentric washer and 21 mm nut go. When first removing the nut, even at full eccentric-driven adjustment, the bolt was in the middle of the left-right adjustment slot seen there. No pic of that.
This pic is after pulling left and right together, bolt here is as far inward as it can go. I think the bolt-head end of this bolt may have had a little more to go, and when installing the washer + nut, and torquing, I expect the bolt moved a little off the limit there. If needed (i.e., desperate), I probably could have shimmed in that gap, preventing the bolt from moving outward at all when finishing things up.
As it was, I lucked out, and ended up at -1.4*, which is almost exactly what I'd get if I could pick anything I wanted, so of course I called it done and have not touched that nut and bolt since.