Classic POA left of center

[alvinSF49]

Hi all!

I took my DW Classic to the range for the first time today and it was shooting tight groups left of center @ 7 yards. A friend and I took turns at it with 200 rounds of 230gr Blazer Brass ammo. We both were shooting fairly tight, just not on target.

After several magazines and some frustration starting to boil I started to aim an inch or so to the right of center @ 7 yards and the POI was dead on. I loaded a few more magazines and told my friend where my POA ("try aiming an inch to the right") was and told him to try it. He too was on target.

We came to the conclusion that it wasn't us and that the sights in this case the rear (I think) needed some adjustment.

Looking closer at the rear sights location, it's not centered, off to the left a bit. I think centering it would put me right on.

The gun is sporting the stock Trijicon sights H3 11. Anyone know the exact size of the set screw?

The set screw on the Classic looks rounded out (uh oh). I looked at my SA Operator sporting Trijicon's also and compared. On the Operator it's obvious that it is a hex set screw. I took my set of hex wrenches and tried a few on the Classic. Out of the hex sizes I have nothing fits tight enough to give it a turn.

Anyway, Is my diagnosis correct from the report at the range, and if anyone knows the exact size of the set screw?