SOMEONE HAS TO HAVE ONE ! HELP ME OUT OR POINT ME IN THE RIGHT DIRECTION. THANKS

Need some help guys. I have a 2nd. Model HE Target in 44 Spl with a one screw rear sight. In the course of getting my gun back from the now out of business company the elevation screw is missing. I do not know what is under the sight on these pre war target guns so I may need a stud also. I don't know.

Help me get this back up and going.

Thanks
Bob

Bump.
Need some love guys. Share with me or tell me who van help.
Much thanks.
Bob