I have intentions of installing a new shorter tritium front sight on my S&W. The Heinie model that I have, is too tall, making the gun shoot low, and has no white outline - which I would like. There is no roll pin in the sight, it is just dovetailed in. I tried using a brass hammer and 10-8 nylon drift punch, and this thing will NOT move. Do I need a sight pusher? Or is there another trick that I'm not privvy to? I used the punch to install the 10-8 rear and it worked perfectly.