@gunrunnerjohn posted:Dremel cutoff wheel.
That's what I used. Diamond abrasive cutoff wheel. Cuts a very fine line. I used a drop of gel CA in the gap and once it's cured the rails can never touch. Hard to even see the repair. I had my brother hold a vacuum close to the cutoff wheel while I ran the grinder. I also ran a big magnet over the area to pick up any filings. j