Congratulations...and you're welcome!
Run a box of balls through the revolver, then start to think about screwing-around with the sights...it just might settle-in some during a normal wearing-in cycle.
If you go to file the notch, take it slow and careful so that you don't wind-up taking off too much meat all at once. This is a job for a day at the range, with a break in-between as well as making sure that the revolver isn't too fouled. This means that you'll need some cleaning solution, patches, cleaning rod, etc. to do the right job.
You shouldn't file the notch with an overly-fouled gun. Remember to cap-off at the line after cleaning the barrel or the cylinder to make sure that you don't get a missfire from wet powder or gunk in the ignition path. A nipple pick in this case is your best friend!
Have fun and don't try to do this in a wind storm!
Dave