I've heard of people welding the grooves up & grinding off smooth with no problems. Also read someone made stainless shims to sit over the whole thing to give a new surface. It stops the pads falling out & moving back & forth too much, that's how you get the grooves. If you build them up with weld don't make the fit too tight or you might have other problems. They're a loose fit when new, so only go back to original size. On mine I just ground them down level as the grooves weren't very deep, maybe weld them next time. I smeared a little bit of anti seize on but I doubt it is of any benefit, probably provides something for the dust to stick to.
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