If you vision isn't what it used to be you might like this idea. A friend gave me these two peep sights. You bend into your eyesight and attach with tape to your glasses. I have not tried it yet but w/the Austin H. shouldered you could see the tiny notch in the buck horn and the front sight clearly. I will try to measure the hole w/ a drill bit later. There are two aperture sizes there.

LOL, SHills