More along the lines of just a flat plate with the dovetail milled in to attach the sight to and to fit the rifle dovetail. That is what it looks like he has done, but used a spare base and hammered it flat from the not so clear photos.

I can easily get the peep to sit at the same height as the original at 200 but would like to get it down to 100 yards (if possible) should be able to work out the height from the original.

Cheers

Richard