I'm adding the MSD 6AL Box to my existing HEI setup. The instructions show the wiring diagram and which wires to use, so that parts all cool. I've got the GM module removed and the new wires installed in the base of the distributor. I bought the MSD "contact button" for the distributor cap. Supposedly the factory one doesn't have the right resistance and can MELT the cap....so they tell you to swap it out. It's just a small metal button with a spring on it. I thought that it must install from the TOP of the distributor cap, but when I pulled the black cover off....I just saw the "coil" there. Do I need to remove it to get to where the button goes......?.....or does the button somehow install from underneath?