The inverse dimples (or whatever you want to call them) certainly mar the finish of the empeg's case, but the only time I've ever seen anything that could lead to actually removing metal from the case was when I had taken out the sled and reinstalled it, but the triple-flexing of the tabs had caused one or two of them to stick further into the case than they should (that is, at all). bending them further out solved that problem. Is it possible that that's the problem you're having?