Originally Posted by RazzBarlow7

If you were real talented with a Dremel or something similar, you could lower the flange further into the case. I doubt my skills with a Dremel to that extent. There are small molded-in ribs on the vertical walls of the Pelican case that the flange sits on.

EDIT: You can see the vertical ribs in the case wall in the photo showing the 2 power supplies in the bottom.