I looked at mine and there is some minor wear showing where it could perhaps be filed down but nothing serious. I suspect my problem is that the pins weren't properly lubricated and as a result they caliper wasn't floating like it should. I just took them all apart and lubricated the pins (they weren't very well lubricated) and took it for a quick drive and it seems to have taken away the intermittent rub sound. All told the job took 35 mins which includes me dragging my tools out of my apt and dragging them back in. Not a bad job at all.
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