Every time the peep topic comes up I post the one I made when I couldn't my sights anymore. It was a "beoch" to bend the sight base to match the tang on my rifle, I bent the peep up so the front and rear sight were perfectly aligned for a shot when I shouldered my rifle.
Start;

Done except for filing out the hammer marks and cleaning things up a bit to be more "professional" looking.

Mounted and adjusted;

In service in a blind I made out of a pile blocks my neighbor left behind his barn, no deer showed up that day to feed in the field I was watching.

Then I had cataract surgery and don't need the peep anymore.