Hello
I have an 686 "no dash from 1982.
I wanna install a newer rear site but the 686 "no dash have only one hole and since the 686-4 they shipped with 3 holes.
Do anyone know the exact dimension of the 3 rear site 686-4 holes.
The new holes are #6-48, the standard for scope mounting screws. From the vertical flat cut by the hammer (on the left in this picture), the 1st hole center is .562, 2nd is 1.224, and 3rd is 1.824. The front end of the tang slot is 2.420.
