The races are hardened. A mild steel rod is softer, so it bends and molds instead of chipping what you're driving. Set it on the notch, on the corner of the race, never the sidewall. Then work a star pattern.
Full video: https://youtu.be/xJHGybEA318
More 2nd gen guides: https://standardamericanoutdoors.com/f/2nd-gen-4runner-maintenance-guide-how-to-make-yours-last-300000
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Full builds, parts and guides: https://standardamericanoutdoors.com
More 2nd gen guides: https://standardamericanoutdoors.com/f/2nd-gen-4runner-maintenance-guide-how-to-make-yours-last-300000