Opening namco famicom games

Anybody know how to open Namco famicom games? I know with regular famicom games you use a handgrip then pry the tabs, but the namco ones don't work that way. I was able to pop out the bottom half by prying in the little indent on the side of the cart and finally popped the tabs at the top by prying into the top, but it still won't open, seems as if its being held together in the center. Any info would help as I want clean the contacts so the game reads a bit better.

 

Namco games have the middle pin GLUED.

 

Crap, well so much for trying to thoroughly clean the pins. Out of all my famicom games lupin is one of the most temperamental, then again it wasn't really in the best condition when I got it. Oh well it works most of the time at least.