Several years ago I put a Wondersight on a 5" Triple Lock, it improved the sight picture and was the simplest way to add an adjustable sight without modifying the revolver. I found the Wondersights sight notch to be shallow and wide, I made a blade from some blued steel shim stock with notch dimensions that suited me and epoxied it on the back of the Wondersight. Problem solved, I was satisfied with the Wondersight.