This diagram doesn't show it, but they were made like that. The bent base acts as a spring to raise the sight when you back off the elevation nut/screw. Tightening the screw draws the sight down. As I mentioned earlier, use a padded C-clamp to draw the front of the base down and tighten the forward screw.It came pretty badly bent. I flattened it out overnight with a weight and that was as far as I could get it.
The bend was not disclosed or shown on eBay but I'm ok with it for now.