I use a drill press to file under the heads. While spinning a file is used to remove a little material at a time until the screw slot is aligned.

When making screws from scratch it is done a little differently, but the above is the way to go with the Galazan screws.

Just for others to use, Brileys removed the screw no damage no issues, for $80. It took them 3 weeks due to prior work load, but it was taken care of and they returned the screw in question, which I have now managed to repair and put back in the gun. It isn't a perfect screw, but it goes well with the rest of the somewhat beatup appearance of the VH in question. Thanks again!