When you said tang sight did you mean a peep sight?
My eyes are 60 years old so I stopped shooting the hawkins as I just could not get the sights and target to focus together. I bought a used Winchester Modle 94 with a lyman peep sight on it. Lo and beholdI could shoot it and the sights just seemed to line up naturaly and in focus.
Longbow bowhunter on this site sent me this T/C peep for my Hawkins and I love it.
This is the groups I got with it useing cross sticks at 50 yards.

Al