I sent my ex-cop 19-3 in to S&W for end shake and forcing cone, etc. issues about a year ago. In addition I requested that the stock Baughman ramp, which was somewhat rounded off, be replaced (it's pinned). They did, which now gives me a nice crisp black front sight.
Check with them as to the availability of a new blade. If the holes aren't pre-drilled, that'll be up to you or your smith...