I purchased a Wolff spring kit for my 459 police trade in. So I'm taking the whole pistol apart to replace the springs. The frame came apart easy and fast. Then when I got to the slide, everything came to a screeching halt. I'm trying to get the decocker/drum out. I removed the phillips screw and lever on the right side. Then I depressed the metal button and pushed in the firing pin. If that makes any sense. But the decocker/drum won't come out. Is there something else I need to do? I don't want to try pounding it out with a punch and damage something.