nukem,
What I did was from a small screw driver a two prong tool to fit the two holes on the adjusting screw. I got the hint from the forum here. I used a Dremel hand grinder. In loosening it if it breaks the points of the screw driver you're not out too much. It worked good for me.
I removed the adjusting screw and l lightly oiled it and added penetrating oil on the sight.
For zeroing it, I shot at 100 yds. and adjusted the fine adj. screw. Clock-wise for lowering the elevation and CC for raising it. ---If you don't have an idea where it's shooting shoot at 25 yds. and adj. there to zero. Oh, just move the screw a little maybe about 5 degrees untill you get the feel of it. Good luck,
M