The front sight on my '03 is loose, I went to tighten it up but the set screw does not tighten the sight. The set screw has a post (unthreaded) section that fits into a recess in the front sight itself. The dovetail also seems to be tapered so as I drift it to the left it gets tighter in the dovetail, but where it tightens up is quite a bit offset to the left. I cannot insert the dovetail from the left to the right, only from the right to the left. Anybody have any advice for me? The sight has "Marble" stamped on one side and "Sheard #11" stamped on the other side. Here are some pics of it.