When I said nothing on it, I meant there's no hole, the side with the screw in it is the only hole in the slider, the other side has no hole, or anything, sounds like they drilled a hole in both sides of yours, not that it would hurt anything, but for a defense contractor, they seem to screw things up a biit, hope they do better for our military!! See how close to the edge the peep hole is in the top pic? They replaced it with one that is centered like in the bottom pic, to my eyes, it looked like a slot instead of an aperture, not very precise work if you ask me.
Tim