My old eyes need a wider notch in rear sight. I am looking for a quality file to open up rear notch. Need file with what I think called safety side. That is narrow side of file is smooth and will not go deeper into notch. Source or exact name of this kind of file appreciated. Also interested if you know of other do it yourself ways to make rear sight notch wider. Thanks.

To "Open Up" a Rear Sight Notch you want the Grobet File Co. "Very Extra Narrow Pillar Files" available at Brownell's...HTH...