I had a drill bit (1 1/16") break during a front sight installation. The sight blade trunnion was blank which required me to clamp it fast and drill through using the existing holes as a guide. Well, I was able to remove the broken bit (whew), but when it broke it I wallowed out the hole on one side. So, after completing the installation I am in need of a little touch up. I thought that using a ball end mill on each exterior side of the hole should clean up my screw up rather nicely. There is a roll pin firmly holding the front sight, and I am not shore if it needs to be shortened or not, but I would really appreciate and help someone could provide. The local shops will not even look at this tiny job as set up would take much longer then the job.